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      <h1 class="mt-5 fs-4">Defines</h1>
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<p class="magick-description">The <a href="command-line-options.html#define">-define</a> command-line option adds specific global settings generally used to control coders and image processing operations.</p>

<p>This option creates one or more definitions for coders and decoders to use
while reading and writing image data.  Definitions are generally used to
control image file format coder modules, and image processing operations,
beyond what is provided by normal means.  Defined settings are listed in <a href="command-line-options.html#verbose">-verbose</a> information ("<samp>info:</samp>" output format) as "Artifacts". </p>

<p>If <var>value</var> is missing for a definition, an empty-valued
definition of a flag is created with that name. This used to control on/off
options.  Use <a href="command-line-options.html#define">-define keys</a> to remove definitions
previously created.  Use <a href="command-line-options.html#define">+define "*"</a> to remove all existing definitions.</p>

<p>The same 'artifact' settings can also be defined using the <a href="command-line-options.html#set">-set "option:<var>key</var>" "<var>value</var>"</a> option, which also allows the use of <a href="../www/escape.html" >Format and Print Image Properties</a> in the defined value. </p>

<p>The <var>option</var> and <var>key</var> are case-independent (they are
converted to lowercase for use within the decoders) while the <var>value</var>
is case-dependent.</p>

<p>Such settings are global in scope, and affect all images and operations. </p>

<pre class="p-3 mb-2 text-body-secondary bg-body-tertiary cli"><samp>magick bilevel.tif -define ps:imagemask eps3:stencil.ps
magick arrow.tga -set colorspace:auto-grayscale=off myArrow.tga </samp></pre>

<p>Set attributes of the image registry by prefixing the value with
<samp>registry:</samp>.  For example, to set a temporary path to put work files,
use:</p>

<pre class="p-3 mb-2 text-body-secondary bg-body-tertiary"><samp>-define registry:temporary-path=/data/tmp </samp></pre>

<p>Here is a list of recognized defines:</p>


<div>

<table class="table table-sm table-hover table-striped table-responsive">
  <tr>
    <th align="center" colspan="2">Command-line Defines</th>
  </tr>

  <tr>
   <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <td>ashlar:best-fit</td>
    <td>align tiles on both the left  and right edges.</td>
  </tr>

  <tr>
    <td>ashlar:tiles</td>
    <td>set the maximum number of image tiles to render per canvas.</td>
  </tr>

  <tr>
    <td>auto-threshold:verbose</td>
    <td>return derived threshold as the <samp>auto-threshold:threshold</samp> image property.</td>
  </tr>

  <tr>
    <td>color:illuminant</td>
    <td>reference illuminant, defaults to D65.</td>
  </tr>

  <tr>
    <td>colorspace:auto-grayscale=<var>on|off</var></td>
    <td>Prevent automatic conversion to grayscale inside coders that support
    grayscale. This should be accompanied by -type truecolor. PNG and TIF do
    not need this define. With PNG, just use PNG24:image. With TIF, just use
    -type truecolor. JPG and PSD will need this define.</td>
  </tr>

  <tr>
    <td>compare:frequency-domain=<var>boolean</var></td>
    <td>Certain similarity metrics such as DPC, MSE, NCC, PSNR, Phase, and RMSE operate in the frequency domain when FFTW and HDRI are enabled. To utilize their spatial equivalents, you can use the command <samp>-define compare:frequency-domain=false</samp>. However, note that DPC and PHASE metrics do not have spatial equivalents, so this command will be ignored for them.</td>
  </tr>

  <tr>
    <td>compare:ssim-radius=<var>value</var></td>
    <td>Set the structural similarity index radius.</td>
  </tr>

  <tr>
    <td>compare:ssim-sigma=<var>value</var></td>
    <td>Set the structural similarity index sigma.</td>
  </tr>

  <tr>
    <td>compare:ssim-k1=<var>value</var></td>
    <td>Set the structural similarity index k1 argument.</td>
  </tr>

  <tr>
    <td>compare:ssim-k2=<var>value</var></td>
    <td>Set the structural similarity index k2 argument.</td>
  </tr>

  <tr>
    <td>compare:virtual-pixels=<var>boolean</var></td>
    <td>ImageMagick compares images pixel by pixel, aligning from the top-left corner. If sizes differ, unmatched areas in the smaller image are treated as virtual pixels, possibly affecting comparison results. To limit comparison to authentic pixels only, use <samp>-define compare:virtual-pixels=false</samp>.</td>
  </tr>

 <tr>
    <td>complex:snr=<var>value</var></td>
    <td>Set the divide SNR constant <a href="command-line-options.html#complex">-complex</a>.</td>
  </tr>

  <tr>
    <td>compose:args=<var>arguments</var></td>
     <td>Set certain compose argument values when using convert ... -compose ...
    -composite. See <a href="../www/compose.html"
    >Image Composition</a>.</td>
  </tr>

  <tr>
    <td>compose:clip-to-self=<var>true|false</var></td>
    <td>Some <a href="command-line-options.html#compose" >-compose</a> methods can modify the
    'destination' image outside the overlay area.  It is disabled by default.</td>
  </tr>

  <tr>
    <td>compose:clamp=<var>on|off</var></td>
    <td>Set each pixel whose value is below zero to zero and any the pixel
    whose value is above the quantum range to the quantum range (e.g. 65535)
    otherwise the pixel value remains unchanged.  Define supported in
    ImageMagick 6.9.1-3 and above.</td>
  </tr>

  <tr>
    <td>compose:colorspace=<var>colorspace</var></td>
    <td>Set the colorspace for the colorize composite operator.  The default is HCL.</td>
  </tr>

  <tr>
    <td>compose:compose=<var>on|off</var></td>
    <td>This special usage allows you to perform true mathematics of the image channels, without alpha composition effects, becoming involved.</td>
  </tr>

  <tr>
    <td>connected-components:angle-threshold=<var>value</var></td>
    <td>Merges any region with equivalent ellipse angle smaller than
    <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:area-threshold=<var>value</var></td>
    <td>Merges any region with area smaller than <var>value</var> into its
    surrounding region or largest neighbor.  Thresholds can optionally include ranges, e.g. 410-1600.</td>
  </tr>

  <tr>
    <td>connected-components:background-id=<var>object-id</var></td>
    <td>Identify which object is to be the background object.
    Supported in Imagemagick 7.0.9.21.</td>
  </tr>

  <tr>
    <td>connected-components:circularity-threshold=<var>value</var></td>
    <td>Merge any region with circularity smaller than <var>value</var>
    into its surrounding region or largest neighbor. Circularity is
    computed as 4*pi*area/perimeter^2.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:diameter-threshold=<var>value</var></td>
    <td>Merge any region with diameter smaller than <var>value</var>
    into its surrounding region or largest neighbor. Diameter is
    computed as sqrt(4*area/pi).
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:eccentricity-threshold=<var>value</var></td>
    <td>Merge any region with equivalent ellipse eccentricity smaller
    than <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:exclude-header=<var>true</var></td>
    <td>List the objects without the header.  Supported in Imagemagick 7.0.9.21.</td>
  </tr>

  <tr>
    <td>connected-components:keep=<var>list-of-ids</var></td>
    <td>Comma and/or hyphenated list of id values to keep in the output.  Supported in Imagemagick 6.9.3-0.</td>
  </tr>

  <tr>
    <td>connected-components:keep-colors=<var>red;green;blue</var></td>
    <td>Keeps objects identified by their color in a semicolon separated list.  Supported in Imagemagick 6.9.3-0.</td>
  </tr>

  <tr>
    <td>connected-components:keep-top=<var>number-of-objects</var></td>
    <td>Keeps only the top number of objects by area.  Supported in Imagemagick 7.0.9.21.</td>
  </tr>

  <tr>
    <td>connected-components:major-axis-threshold=<var>value</var></td>
    <td>Merge any region with equivalent ellipse major axis diameter smaller
    than <var>value</var> into its surrounding region or largest neighbor.
    Supported in Imagemagick 7.0.9.24.</td>
  </tr>

 <tr>
    <td>connected-components:mean-color=<var>true</var></td>
    <td>Change the output image from id values to mean color values. Supported in Imagemagick 6.9.2-8.</td>
  </tr>

  <tr>
    <td>connected-components:minor-axis-threshold=<var>value</var></td>
    <td>Merge any region with equivalent ellipse minor axis diameter smaller than <var>value</var> into its surrounding region or largest neighbor.  Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:perimeter-threshold=<var>value</var></td>
    <td>Merge any region with perimeter smaller than <var>value</var> into its surrounding region or largest neighbor.  Supported in Imagemagick 7.0.9.24.</td>
  </tr>

  <tr>
    <td>connected-components:remove=<var>list-of-ids</var></td>
    <td>Comma and/or hyphenated list of id values to remove from the output.
     Supported in Imagemagick 6.9.2-9.</td>
  </tr>

  <tr>
    <td>connected-components:remove-colors=<var>red;green;blue</var></td>
    <td>Remove objects identified by their color in a semicolon separated list.
    Supported in Imagemagick 6.9.3-0.</td>
  </tr>

  <tr>
    <td>connected-components:verbose=<var>true</var></td>
    <td>Lists id, bounding box, centroid, area, mean color for each region.</td>
  </tr>

  <tr>
    <td>convolve:scale=<var>{kernel_scale}[!^] [,{origin_addition}] [%]</var></td>
     <td>Define the kernel scaling. The special flag ! automatically scales to
    full dynamic range. The ! flag can be used in combination with a factor or
    percent. The factor or percent is then applied after the automatic scaling.
    An example is 50%!. This produces a result 50% darker than full dynamic
    range scaling. The ^ flag assures the kernel is 'zero-summing', for
    example when some values are positive and some are negative as in edge
    detection kernels. The origin addition adds that value to the center
    pixel of the kernel. This produces an effect that is like adding the image
    that many times to the result of the filtered image. The typical value
    is 1 so that the original image is added to the result of the convolution.
    The default is 0.</td>
  </tr>

  <tr>
    <td>deskew:auto-crop=<var>true</var></td>
    <td>auto crop the image after deskewing.</td>
  </tr>

  <tr>
    <td>delegate:bimodal=<var>true</var></td>
    <td>Specify direct conversion from Postscript to PDF.</td>
  </tr>

  <tr>
    <td>distort:scale=<var>value</var></td>
    <td>Set the output scaling factor for use with <a href="command-line-options.html#distort"
   >-distort</a>.</td>
  </tr>

  <tr>
    <td>distort:viewport=<var>WxH+X+Y</var></td>
    <td>Set the viewport for use with <a href="command-line-options.html#distort">-distort</a>.</td>
  </tr>

  <tr>
    <td>dither:diffusion-amount=<var>X%</var></td>
    <td>Set the amount of diffusion to use with Floyd-Steinberg diffusion</td>
  </tr>

  <tr>
    <td>exif:sync-image=false</td>
    <td>By default, the resolution of the image is synced with the EXIF profile.  Use this define to ignore the EXIF profile.</td>
  </tr>

  <tr>
    <td>filename:literal=<var>true</var></td>
    <td>By default, output filenames can contain <a href="command-line-processing.html#output">embedded formatting characters</a>.  Use this option to bypass interpreting embedded formatting characters and instead use the filename literally.</td>
  </tr>

  <tr>
    <td>filter:option=<var>value</var></td>
     <td>Set a filter option for use with <a href="command-line-options.html#resize">-resize</a>.
    See below for specific options.</td>
  </tr>

  <tr>
    <td>filter:b=<var>value</var></td>
    <td>Redefine the spline factor used for cubic filters such as Cubic,
    Catrom, Mitchel, and Hermite, as well as the Parzen cubic windowing
    function. If only one of the b or c values are defined, the other is
    set so as to generate a 'Cubic-Keys' filter. The meaning of the b and c
    values was defined in a research paper by Mitchell-Netravali.</td>
  </tr>

  <tr>
    <td>filter:blur=<var>factor</var></td>
    <td>Scale the X axis of the filter (and its window). Use > 1.0 for blurry
    or &lt; 1.0 for sharp. This should only be used with Gaussian and
    Gaussian-like filters simple filters, or you may not get the
    expected results.</td>
  </tr>

  <tr>
    <td>filter:c=<var>value</var></td>
    <td>Redefine the Keys alpha factor used for cubic filters such as Cubic,
    Catrom, Mitchel, and Hermite, as well as the Parzen cubic windowing
    function. If only one of the b or c values are defined, the other is
    set so as to generate a 'Cubic-Keys' filter. The meaning of the b and c
    values was defined in a research paper by Mitchell-Netravali.</td>
  </tr>

  <tr>
    <td>filter:kaiser-alpha=<var>value</var></td>
    <td>Set the Kaiser window alpha value. When it is multiplied by 'PI',
    it is equivalent to "kaiser-beta" and will override that setting.
    It only affects the Kaiser windowing function and does not affect
    any other attributes.</td>
  </tr>

  <tr>
    <td>filter:kaiser-beta=<var>value</var></td>
    <td>Set the Kaiser window beta value. It only affects Kaiser windowing
    function and does not affect any other attributes. Before ImageMagick
    v6.7.6-10, this option was known as "filter:alpha" (an inheritance
    from the very old "zoom" program). It was changed to bring the function
    in line with more modern academic research usage and better assign it
    be more definitive. The default value is 6.5</td>
  </tr>

 <tr>
    <td>filter:lobes=<var>count</var></td>
    <td>Set the number of lobes to use for the Sinc/Bessel filter.
    This is an alternate way of specifying the 'support' range of the filter,
    that is designed to be more suited to windowed filters, especially when
    used for image distorts.</td>
  </tr>

  <tr>
    <td>filter:sigma=<var>value</var></td>
    <td>Set the 'sigma' value used to define the Gaussian filter.
    The default sigma value is '0.5'. It only affects the Gaussian filter,
    but does not shrink (but may enlarge) the filter's 'support'.
    It can be used to generate very small blurs, but without the filter
    'missing' pixels due to using a small support setting.
    A larger value of '0.707' (a value of '1/sqrt(2)') is another
    common setting.</td>
  </tr>

  <tr>
    <td>filter:support=<var>radius</var></td>
    <td>Set the filter support radius. It defines how large the filter
    should be and thus directly defines how slow the filtered resampling
    process is. All filters have a default 'preferred' support size.
    Some filters like Lagrange and windowed filters adjust themselves
    depending on this value. With simple filters this value either does
    nothing (but slow the resampling), or will clip the filter function
    in a detrimental way.</td>
  </tr>

  <tr>
    <td>filter:verbose=<var>true</var></td>
    <td>Enable printing of information about the final internal
    filter selection to standard output. This includes a commented header
    on the filter settings being used and data allowing the filter weights
    to be easily graphed. Note however that some filters are internally
    defined in terms of other filters. The Lanczos filter, for example,
    is defined in terms of a SincFast windowed SincFast filter, while
    the Mitchell filter is defined as a general Cubic family filter
    with specific 'B' and 'C' settings.</td>
  </tr>

  <tr>
    <td>filter:window=<var>filter_function</var></td>
    <td>The IIR (infinite impulse response) filters Sinc and Jinc are
    windowed (brought down to zero over the defined support range) with
    the given filter. This allows you to specify a filter function to be
    used as a windowing function for these IIR filters. Many of the defined
    filters are actually windowing functions for these IIR filters. A typical
    choices is Box, (which effectively turns off the windowing function).</td>
  </tr>

  <tr>
    <td>filter:window-support=<var>radius</var></td>
    <td>Scale the windowing function to this size. This causes
    the windowing (or self-windowing Lagrange filter) to act is if the
    support window is larger than what is actually supplied to the calling
    operator. The filter, however, is still clipped to the true support
    size that is provided. If unset, this will equal the normal filter
    support size.</td>
  </tr>

  <tr>
    <td>h:format=<var>value</var></td>
    <td>Set the image encoding format use when writing a C-style header.
    <var>format</var> can be any output format supported by ImageMagick
    except for <var>h</var> and <var>magick</var>.  If this
    option is omitted, the default is <var>GIF</var> for PseudoClass
    images and <var>PNM</var> for DirectClass images.</td>
  </tr>

  <tr>
    <td>fourier:normalize=<var>inverse</var></td>
    <td>Set the location for the FFT/IFT normalization as use by
    <a href="command-line-options.html#fft">+-fft</a> and <a href="command-line-options.html#ift">+-ift</a>. The default is
    <var>forward</var>.</td>
  </tr>

  <tr>
    <td>frames:step</td>
    <td>When selecting image <a href="command-line-processing.html">frames</a>, the default is to step one frame at a time through a list, e.g. [0-3], returns frames 0, 1, 2, and 3.  Set the step to 2 in this example and we instead get frames 0 and 2.</td>
  </tr>

  <tr>
    <td>fx:debug=true</td>
    <td>Debug <samp>-fx</samp> expression.</td>
  </tr>

  <tr>
    <td>hough-lines:accumulator=true</td>
    <td>Return the accumulator image in addition to the lines image.</td>
  </tr>

  <tr>
    <td>json:features</td>
    <td>Include features in verbose information.</td>
  </tr>

  <tr>
    <td>json:limit</td>
    <td> </td>
  </tr>

  <tr>
    <td>json:locate</td>
    <td> </td>
  </tr>

  <tr>
    <td>json:moments</td>
    <td>Include image moments in verbose information.</td>
  </tr>

  <tr>
    <td>kmeans:seed-colors=<var>color-list</var></td>
    <td>Initialize the colors, where color-list is a semicolon delimited
    list of seed colors (e.g. red;sRGB(19,167,254);#00ffff)</td>
  </tr>

 <tr>
    <td>magick:format=<var>value</var></td>
    <td>Set the image encoding format use when writing a C-style header.
    This is the same as "h:format=format" described above.</td>
  </tr>

  <tr>
    <td>magnify:method=<var>value</var></td>
    <td>Choose the method of pixel art magnification. The choices are:
    eagle2X, eagle3X, eagle3XB, epb2X, fish2X, hq2X, scale2X (default),
    scale3X, xbr2X</td>
  </tr>

  <tr>
    <td>modulate:colorspace=<var>colorspace</var></td>
    <td>Define the colorspace to use with <a href="command-line-options.html#modulate">-modulate</a>.
    Any hue-based colorspace may be use. The default is HSL.</td>
  </tr>

 <tr>
    <td>morphology:compose=<var>compose-method</var></td>
    <td>Specify how to merge results generated by multiple<a
    href="#morphology" >-morphology</a> kernel. The default is none. One
    typical value is 'lighten' as used, for example, with the sobel edge
    kernels. </td>
  </tr>

  <tr>
    <td>morphology:showKernel=<var>1</var></td>
    <td>Output (to 'standard error') all the information about a generated <a
    href="#morphology" >-morphology</a> kernel.</td>
  </tr>

  <tr>
    <td>phash:colorspaces=<var>colorspace,colorspace,...</var></td>
    <td>The perceptual hash defaults to the xyY and HSB colorspaces.  When
    using this define, you can specify up to six alternative colorspaces. (as
    of IM 7.0.3-8)</td>
  </tr>

  <tr>
    <td>phash:normalize=<var>true</var></td>
    <td>Normalize the phash metric</td>
  </tr>

  <tr>
    <td>pixel:compliance=<var>{none|undefined|svg|mvg|x11|xpm}</var></td>
    <td>In combination with <a href="command-line-options.html#depth">-depth</a>, this define allows color values to be presented in one or combination of: percent, names, 8-bit components, or hex values. 16-bit depth values are generally shown as percents and 8-bit depth values generally are shown as a combination of color names and 8-bit component values.</td>
  </tr>

  <tr>
    <td>png:bit-depth=<var>value</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>png:chunk-malloc-max=<var>value</var></td>
    <td>Set the maximum chunk size.</td>
  </tr>

  <tr>
    <td>profile:skip=<var>name1,name2,...</var></td>
    <td>Skip the named profile[s] when reading the image. Use skip="*" to
    skip all named profiles in the image. Many named profiles exist,
    including ICC, EXIF, APP1, IPTC, XMP, and others.</td>
  </tr>

  <tr>
    <td>precision:highres-transform=<var>true</var></td>
    <td>Increase the profile transform precision. Note, there is a slight
    performance penalty as the high-precision transform is floating point
    rather than unsigned. It is important to note that results may depend
    on whether or not the original image already has an included profile.</td>
  </tr>

  <tr>
    <td>preserve-timestamp=<var>true|false</var></td>
    <td>Preserve file timestamp (<samp>mogrify</samp> only).</td>
  </tr>

  <tr>
    <td>q-table=<var>quantization-table.xml</var></td>
    <td>Custom JPEG quantization tables.</td>
  </tr>

  <tr>
    <td>quantum:format=<var>type</var></td>
    <td>Set the type to <samp>floating-point</samp> to specify a floating-point
    format for raw files (e.g. GRAY:) or for MIFF and TIFF images in HDRI mode
    to preserve negative values. If <a href="command-line-options.html#depth">-depth</a> 16 is
    included, the result is a single precision floating point format.
    If <a href="command-line-options.html#depth">-depth</a> 32 is included, the result is
    double precision floating point format. For signed pixel data, use <samp>-define quantum:format=signed</samp></td>
  </tr>

  <tr>
    <td>quantum:maximum=<var>value</var></td>
    <td>Maximum value for certain image types such as DCM. If not set, the
    the maximum value is QuantumRange.</td>
  </tr>

  <tr>
    <td>quantum:minimum=<var>value</var></td>
    <td>Minimum value for certain image types such as DCM. If not set, the
    the minimum value is zero.</td>
  </tr>

 <tr>
    <td>quantum:polarity=<var>photometric-interpretation</var></td>
    <td>Set the photometric-interpretation of an image (typically for TIFF
    image file format) to either <samp>min-is-black</samp> (default) or
    <samp>min-is-white</samp>.</td>
  </tr>

  <tr>
    <td>registry:<var>attribute</var>=<var>value</var></td>
    <td>Set attributes of the image registry, for example,
    registry:temporary-path=/data/tmp.
    </td>
  </tr>

  <tr>
    <td>registry:date:precision=<var>length</var></td>
    <td>Set the maximum number of characters printed for any timestamp.</td>
  </tr>

  <tr>
    <td>registry:option:pedantic=<var>true | false</var></td>
    <td>By default, if a command-line option is also a filename (e.g., -quality), it is intrepetted as a filename.  Set this option to <samp>true</samp> to interpret it as an option. </td>
  </tr>

  <tr>
    <td>registry:precision=<var>value</var></td>
    <td>Set the maximum number of significant digits to be printed.</td>
  </tr>

  <tr>
    <td>resample:verbose=<var>true</var></td>
    <td>Output the cylindrical filter lookup table created by the EWA
    (Elliptical Weighted Average) resampling algorithm. Note this table
    uses a squared radius lookup value. This is typically only used for
    debugging EWA resampling.
    </td>
  </tr>

  <tr>
    <td>sample:offset=<var>geometry</var></td>
    <td>Location of the sampling point within the sub-region being sampled,
    expressed as percentages (see <a href="command-line-options.html#sample" >-sample</a>).</td>
  </tr>

  <tr>
    <td>shepards:power=<var>value</var></td>
    <td>Set the exponent in the Shepard's distortion. The default is 2.</td>
  </tr>

  <tr>
    <td>stream:buffer-size=<var>value</var></td>
    <td>Set the stream buffer size.  Select 0 for unbuffered I/O.</td>
  </tr>

  <tr>
    <td>trim:percent-background=<var>X%</var></td>
    <td>Set the amount of background that is tolerated in an edge. It is
    specified as a percent. 0% means no background is tolerated.
    50% means an edge can contain up to 50% pixels that are background per
    the fuzz-factor.</td>
  </tr>

  <tr>
    <td>trim:edges={<var>north,east,south,west</var>}</td>
    <td>Only trim the specified edges of the image.</td>
  </tr>

  <tr>
    <td>trim:minSize=<var>geometry</var></td>
    <td>Limit the trim to the specified size.</td>
  </tr>

  <tr>
    <td>type:features=<var>string</var></td>
    <td>Add a font feature to be used by the RAQM delegate during complex
    text layout. This is usually used to turn on optional font features that
    are not enabled by default, but can be also used to turn off default font
    features. Features include those to control kerning, ligature and Arabic.</td>
  </tr>

  <tr>
    <td>type:hinting=<var>false</var></td>
    <td>Disable font hinting. Proper glyph rendering needs the scaled points
    to be aligned along the target device pixel grid, through an operation
    often called hinting. One of its main purposes is to ensure that important
    widths and heights are respected throughout the whole font. (For example,
    it is very often desirable that the ‘I’ and the ‘T’ glyphs have their
    central vertical line of the same pixel width. Hinting also manages
    features like stems and overshoots, which can cause problems at small
    pixel sizes.</td>
  </tr>

  <tr>
    <td>white-balance:vibrance=<var>value{%}</var></td>
    <td>Change in color vibrance of the a &amp; b channels.</td>
  </tr>

  <tr>
    <td>x:screen=<var>true</var></td>
    <td>Obtain the image from the root window.</td>
  </tr>

  <tr>
    <td>x:silent=<var>true</var></td>
    <td>Turn off the beep when importing an image.</td>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <th align="center" colspan="2">IMAGE FORMATS</th>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <td>bmp3:alpha=<var>true|false</var></td>
    <td>Include any alpha channel when writing in the BMP image format.</td>
  </tr>

  <tr>
    <td>bmp:format=<var>value</var></td>
    <td>Valid values are <var>bmp2</var>, <var>bmp3</var>,
    and <var>bmp4</var>.  This option can be useful when the
    method of prepending "BMP2:" to the output filename is inconvenient or
    is not available, such as when using the <a href="mogrify.html">mogrify</a>
    utility.</td>
  </tr>

  <tr>
    <td>bmp:subtype=<var>value</var></td>
    <td>BMP channel depth subtypes. The choices are: RGB555, RGB565, ARGB4444,
    ARGB1555. Only support in BMP (BMP4). BMP3 and BMP2 do not contain header
    fields to support these options.</td>
  </tr>

  <tr>
    <td>{caption,label}:{max,start}-pointsize=<var>value</var></td>
    <td>This sets the bounding pointsize to use when searching for the maximum pointsize where the text annotation still fits within the image boundaries.</td>
  </tr>

  <tr>
    <td>dcm:display-range=<var>reset</var></td>
    <td>Set the display range to the minimum and maximum pixel values for the
    DCM image format.</td>
  </tr>

  <tr>
    <td>dcm:rescale=<var>true</var></td>
     <td>Enable interpretation of the rescale slope and intercept settings
     in the file.</td>
  </tr>

  <tr>
    <td>dcm:rescale=<var>true</var></td>
    <td>Enable interpretation of the rescale slope and intercept settings
    in the file.</td>
  </tr>

  <tr>
    <td>dcm:window=<var>CxW</var></td>
    <td>Specify the dcm window center and width.</td>
  </tr>

  <tr>
    <td>dds:cluster-fit=<var>true|false</var></td>
    <td>Enable the DDS cluster-fit.</td>
  </tr>

  <tr>
    <td>dds:compression=<var>dxt1|dxt5|none</var></td>
    <td>Set the dds compression.</td>
  </tr>

  <tr>
    <td>dds:mipmaps=<var>value</var></td>
    <td>Set the dds number of mipmaps.</td>
  </tr>

  <tr>
    <td>dds:weight-by-alpha=<var>true|false</var></td>
    <td>Enable the DDS alpha weighting.</td>
  </tr>

  <tr>
    <td>dng:max-raw-memory=<var>value</var></td>
    <td>Stop processing if raw buffer size grows larger than that value (in megabytes). Default is 8192.</td>
  </tr>

  <tr>
    <td>dng:no-auto-bright=<var>true</var></td>
    <td>Disable the histogram-based white level.</td>
  </tr>

  <tr>
    <td>dng:output-color=<var>value</var></td>
    <td>Select the output colorspace. The choices are:
    0 - Raw color (unique to each camera),
    1 - sRGB D65 (default),
    2 - Adobe RGB (1998) D65,
    3 - Wide Gamut RGB D65,
    4 - Kodak ProPhoto RGB D65,
    5 - XYZ,
    6 - ACES</td>
  </tr>

  <tr>
    <td>dng:read-thumbnail=<var>true</var></td>
    <td>Read the embedded thumbnail and store it as a profile called 'dng:thumbnail'.</td>
  </tr>

  <tr>
    <td>dng:use-auto-wb=<var>true</var></td>
    <td>Compute the white balance by averaging the entire image.</td>
  </tr>

  <tr>
    <td>dng:use-camera-wb=<var>true</var></td>
    <td>Uses the white balance specified by the camera.  Default is true.</td>
  </tr>

  <tr>
    <td>dot:layout-engine=<var>value</var></td>
    <td>Specify the layout engine for the DOT image format (e.g., <samp>neato</samp>).</td>
  </tr>

  <tr>
    <td>eps:use-cropbox=<var>true</var></td>
    <td>Force Imagemagick to respect the crop box.</td>
  </tr>

  <tr>
    <td>exr:color-type=<var>value</var></td>
    <td>Specify the color type for the EXR format: RGB, RGBA, YC, YCA, Y,
    YA, R, G, B, A).</td>
  </tr>

  <tr>
    <td>fpx:view=<var>value</var></td>
    <td>Specify the FlashPix viewing object, which contains the specification
    of a viewing transform. The viewing transform enables applications to
    represent a set of simple edits as a list of "commands" which are applied
    to the image in real time without altering the original image.</td>
  </tr>

  <tr>
    <td>ftxt:chsep=<var>value</var></td>
    <td>A single text character that separates channel values for reading and
    writing. Default: "," (Comma).</td>
  </tr>

  <tr>
    <td>ftxt:format=<var>value</var></td>
    <td>The format string for writing and reading. Default: "\x,\y:\c".
    For escapes \x etc, see
    [ftxt: formatted text](http://im.snibgo.com/fmttxt.htm).</td>
  </tr>

  <tr>
    <td>ftxt:hasalpha=<var>value</var></td>
    <td>Whether the text has an alpha channel, for reading only.
    Default: false.</td>
  </tr>

  <tr>
    <td>ftxt:nummeta=<var>value</var></td>
    <td>The number of meta channels, for reading only. Default 0 (Zero).</td>
  </tr>

  <tr>
    <td>heic:chroma=<var>value</var></td>
    <td>Set the HEIC chroma parameter. Possible values are: "420", "422", "444". Default is "420".</td>
  </tr>

  <tr>
    <td>heic:cicp=<var>value</var></td>
    <td>Set the HEIC color primaries, transfer characteristics, matrix coefficients, and full range flag. Use <samp>1/13/6/1</samp> for full range BT.709.  See ISO/IEC 14496-12:2022 standard for a description of these fields and values.</td>
  </tr>

  <tr>
    <td>heic:depth-image=<var>true</var></td>
    <td>Extract the depth image if the container has one.</td>
  </tr>

  <tr>
    <td>heic:max-number-of-tiles=<var>value</var></td>
    <td>Sets the maximum number of tiles of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:max-bayer-pattern-pixels=<var>value</var></td>
    <td>Sets the maximum bayer pattern size in pixels of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:max-items=<var>value</var></td>
    <td>Sets the maximum number of items in a box of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:max-components=<var>value</var></td>
    <td>Sets the maximum number of components of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:max-iloc-extents-per-item=<var>value</var></td>
    <td>Sets the maximum number of extents in iloc box of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:max-size-entity-group=<var>value</var></td>
    <td>Sets the maximum size of an entity group of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:mmax-children-per-box=<var>value</var></td>
    <td>Sets the maximum number of children per box of a HEIC image.</td>
  </tr>

  <tr>
    <td>heic:preserve-orientation=<var>true</var></td>
    <td>Preserve the original EXIF orientation during HEIC decoding and rotate
    the pixels accordingly. By default, EXIF orientation is reset to "1" to
    match the actual orientation of pixels in HEIC.
    </td>
  </tr>

  <tr>
    <td>heic:speed=<var>value</var></td>
    <td>Set the HEIC speed parameter. Integer value from 0-9. Default is 5.</td>
  </tr>

  <tr>
    <td>icon:auto-resize</td>
    <td>Automatically stores multiple sizes when writing an ico image
    (requires a 256x256 input image).</td>
  </tr>

  <tr>
    <td>identify:convex-hull=<var>true</var></td>
    <td>Display convex hull &amp; minimum bounding box.</td>
  </tr>

  <tr>
    <td>identify:locate=<var>value</var></td>
    <td>Display minimum or maximum pixel locations. Valid values are <samp>minimum</samp> or <samp>maximum</samp>. The default is <samp>maximum</samp>.</td>
  </tr>

  <tr>
    <td>identify:limit=<var>value</var></td>
    <td>The maximum number of pixel locations to display when using <samp>identify:locate</samp>.</td>
  </tr>

  <tr>
    <td>jp2:layer-number=<var>value</var></td>
    <td>Set the maximum number of quality layers to decode. Same for JPT, JC2,
    and J2K.</td>
  </tr>

  <tr>
    <td>jp2:number-resolutions=<var>value</var></td>
    <td>Set the number of resolutions to encode.Same for JPT, JC2, and
    J2K.</td>
  </tr>

  <tr>
    <td>jp2:progression-order=<var>value</var></td>
    <td>Choose from LRCP, RLCP, RPCL, PCRL or CPRL. Same for JPT, JC2, and
    J2K.</td>
  </tr>

  <tr>
    <td>jp2:quality=<var>value,value...</var></td>
    <td>Set the quality layer PSNR, given in dB. The order is from left to
    right in ascending order. The default is a single lossless quality layer.
    Same for JPT, JC2, and J2K.</td>
  </tr>

  <tr>
    <td>jp2:rate=<var>value</var></td>
     <td>Specify the compression factor to use while writing JPEG-2000 files.
     The compression factor is the reciprocal of the compression ratio. The
     valid range is 0.0 to 1.0, with 1.0 indicating lossless compression. If
     defined, this value overrides the -quality setting.  A quality setting
     of 75 results in a rate value of 0.06641. Same for JPT, JC2, and J2K.</td>
  </tr>

  <tr>
    <td>jp2:reduce-factor=<var>value</var></td>
    <td>Set the number of highest resolution levels to be discarded.Same for
    JPT, JC2, and J2K.</td>
  </tr>

  <tr>
    <td>jpeg:arithmetic-coding=<var>on|off</var></td>
     <td>enable/disable Huffman optimization.</td>
  </tr>

  <tr>
    <td>jpeg:block-smoothing=<var>on|off</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:colors=<var>value</var></td>
     <td>Set the desired number of colors and let the JPEG encoder do the
    quantizing.</td>
  </tr>

  <tr>
    <td>jpeg:dct-method=<var>value</var></td>
    <td>Choose from <samp>default</samp>, <samp>fastest</samp>,
    <samp>float</samp>, <samp>ifast</samp>, and <samp>islow</samp>.</td>
  </tr>

  <tr>
    <td>jpeg:extent=<var>value</var></td>
    <td>Restrict the maximum JPEG file size, for example <samp>-define
    jpeg:extent=400KB</samp>.  The JPEG encoder will search for the highest
    compression quality level that results in an output file that does not
    exceed the value. The <samp>-quality</samp> option also will be respected
    starting with version 6.9.2-5. Between 6.9.1-0 and 6.9.2-4, add -quality
    100 in order for the jpeg:extent to work properly. Prior to 6.9.1-0, the
    -quality setting was ignored.</td>
  </tr>

  <tr>
    <td>jpeg:fancy-upsampling=<var>on|off</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:optimize-coding=<var>on|off</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:q-table=<var>table</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:restart-interval=<var>value</var></td>
    <td>Set the restart interval to `interval` MCU blocks.</td>
  </tr>

  <tr>
    <td>jpeg:sampling-factor=<var>sampling-factor-string</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>jpeg:size=<var>geometry</var></td>
    <td>Set the size hint of a JPEG image, for
    example, <samp>-define jpeg:size=128x128</samp>.
    It is most useful for increasing performance and reducing the memory
    requirements when reducing the size of a large JPEG image.</td>
  </tr>

  <tr>
    <td>jxl:decoding-speed=<var>value</var></td>
    <td>Set the jpeg-xl decoding speed. Valid values are in the range of 0 (slowest) to 4 (fastest, at the cost of some quality/density).</td>
  </tr>

  <tr>
    <td>jxl:effort=<var>value</var></td>
    <td>Set the jpeg-xl encoding effort. Valid values are in the range of 3 (falcon) to 9 (tortoise).</td>
  </tr>

  <tr>
    <td>minimum-bounding-box:orientation=<var>value</var></td>
    <td>Find smallest perpendicular distance from edge to origin. Valid values are <samp>horizontal</samp>
    and <samp>vertical</samp>.
    </td>
  </tr>

  <tr>
    <td>mng:need-cacheoff</td>
    <td>turn playback caching off for streaming MNG.</td>
  </tr>

  <tr>
    <td>pcl:fit-to-page=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:author=<var>author</var></td>
    <td>Sets the author of the document</td>
  </tr>

  <tr>
    <td>pdf:create-epoch=<var>seconds</var></td>
    <td>Sets the creation time of the document</td>
  </tr>

  <tr>
    <td>pdf:creator=<var>creator</var></td>
    <td>Sets the creator of the document</td>
  </tr>

  <tr>
    <td>pdf:fit-page=<var>geometry</var></td>
    <td><var>Geometry</var> specifies the scaling dimensions for resizing when the PDF is being read. The geometry is either WxH{%} or page size. No offsets are allowed. (introduced in IM 6.8.8-8)</td>
  </tr>

  <tr>
    <td>pdf:fit-to-page=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:hide-annotations=<var>true</var></td>
    <td>hide annotations associated with the page Annots key.</td>
  </tr>

  <tr>
    <td>pdf:interpolate=<var>true</var></td>
    <td>enable interpolation while rendering</td>
  </tr>

  <tr>
    <td>pdf:keywords=<var>keywords</var></td>
    <td>Sets the keywords of the document</td>
  </tr>

  <tr>
    <td>pdf:modify-epoch=<var>seconds</var></td>
    <td>Sets the modification time of the document</td>
  </tr>

  <tr>
    <td>pdf:no-identifier=<var>true</var></td>
    <td>Do not generate the ID entry</td>
  </tr>

  <tr>
    <td>pdf:page-direction=<var>right-to-left</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:printed=<var>true</var></td>
    <td>Determines whether the file should be displayed or printed using the "screen" or "printer" options for annotations and images.</td>
  </tr>

  <tr>
    <td>pdf:producer=<var>producer</var></td>
    <td>Sets the producer of the document</td>
  </tr>

  <tr>
    <td>pdf:subject=<var>subject</var></td>
    <td>Sets the subject of the document</td>
  </tr>

  <tr>
    <td>pdf:stop-on-error=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:thumbnail=<var>false</var></td>
    <td>Generate image thumbnails when saving a PDF file.</td>
  </tr>

  <tr>
    <td>pdf:title=<var>title</var></td>
    <td>Sets the title of the document</td>
  </tr>

  <tr>
    <td>pdf:use-cropbox=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>pdf:use-trimbox=<var>true</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>png:color-type=<var>value</var></td>
    <td>Desired bit-depth and color-type for PNG output.  You can force the
    PNG encoder to use a different bit-depth and color-type than it would have
    normally selected, but only if this does not cause any loss of image
    quality. Any attempt to reduce image quality is treated as an error and no
    PNG file is written.  E.g., if you have a 1-bit black-and-white image, you
    can use these "defines" to cause it to be written as an 8-bit grayscale,
    indexed, or even a 64-bit RGBA.  But if you have a 16-million color image,
    you cannot force it to be written as a grayscale or indexed PNG.  If you
    wish to do this, you must use the appropriate <a href="command-line-options.html#depth">-depth</a>,
    <a href="command-line-options.html#colors">-colors</a>, or <a href="command-line-options.html#type">-type</a> directives to
    reduce the image quality prior to using the PNG encoder. Note that in
    indexed PNG files, "bit-depth" refers to the number of bits per index,
    which can be 1, 2, 4, or 8.  In such files, the color samples always have
    8-bit depth.</td>
  </tr>

  <tr>
    <td>png:compression-filter=<var>value</var></td>
    <td>Valid values are 0 through 9. 0-4 are the corresponding PNG filters,
    5 means adaptive filtering except for images with a colormap, 6 means
    adaptive filtering for all images, 7 means MNG "loco" compression, 8 means
    Z_RLE strategy with adaptive filtering, and 9 means Z_RLE strategy with no
    filtering.</td>
  </tr>

  <tr>
    <td>png:compression-level=<var>value</var></td>
    <td>Valid values are 0 through 9, with 0 providing the least, but fastest
    compression and 9 usually providing the best and always the slowest.</td>
  </tr>

  <tr>
    <td>png:compression-strategy=<var>value</var></td>
    <td>Valid values are 0 through 4, meaning default, filtered, huffman_only,
    rle, and fixed ZLIB compression strategy. If you are using an old zlib
    that does not support Z_RLE (before 1.2.0) or Z_FIXED (before 1.2.2.2),
    values 3 and 4, respectively, will use the zlib default strategy
    instead.</td>
  </tr>

  <tr>
    <td>png:format=<var>value</var></td>
    <td> valid values are <var>png8</var>, <var>png24</var>,
    <var>png32</var>, <var>png48</var>,
    <var>png64</var>, and <var>png00</var>.
    This property is useful for specifying
    the specific PNG format to be used, when the usual method of prepending the
    format name to the output filename is inconvenient, such as when writing
    a PNG-encoded ICO file or when using <a href="mogrify.html">mogrify</a>.
    Value = <var>png8</var> reduces the number of colors to 256,
    only one of which may be fully transparent, if necessary.  The other
    values do not force any reduction of quality; it is an error to request
    a format that cannot represent the image data without loss (except that
    it is allowed to reduce the bit-depth from 16 to 8 for all formats).
    Value = <var>png24</var> and <var>png48</var>
    allow transparency, only if a single color is fully transparent and that
    color does not also appear in an opaque pixel; such transparency is
    written in a PNG <samp>tRNS</samp> chunk.
    Value = <var>png00</var> causes the image to inherit its
    color-type and bit-depth from the input image, if the input was also
    a PNG.</td>
  </tr>

  <tr>
    <td>png:exclude-chunk=<var>value</var></td>
    <td> </td>
  </tr>
  <tr>
    <td>png:include-chunk=<var>value</var></td>
    <td>ancillary chunks to be excluded from or included in PNG output.

    <p>The <var>value</var> can be the name of a PNG chunk-type such
    as <var>bKGD</var>, a comma-separated list of chunk-names
    (which can include the word <var>date</var>, the word
    <var>all</var>, or the word <var>none</var>).
    Although PNG chunk-names are case-dependent, you can use all lowercase
    names if you prefer.</p>

    <p>The "include-chunk" and "exclude-chunk" lists only affect the behavior
    of the PNG encoder and have no effect on the PNG decoder.</p>

    <p>As a special case, if the <samp>sRGB</samp> chunk is excluded and
    the <samp>gAMA</samp> chunk is included, the <samp>gAMA</samp> chunk will
    only be written if gamma is not 1/2.2, since most decoders do not assume
    sRGB for gAMA=0.45455 when no colorspace information is included in
    the PNG file.  Because the list is processed from left to right, you
    can achieve this with a single define:</p>

    <pre class="p-3 mb-2 text-body-secondary bg-body-tertiary"><samp>-define png:include-chunk=none,gAMA
    </samp></pre>

    <p>As a special case, if the <samp>sRGB</samp> chunk is not excluded and
    the PNG encoder recognizes that the image contains the sRGB ICC profile,
    the PNG encoder will write the <samp>sRGB</samp> chunk instead of the
    entire ICC profile.  To force the PNG encoder to write the sRGB
    profile as an <samp>iCCP</samp> chunk in the output PNG instead of the
    <samp>sRGB</samp> chunk, exclude the <samp>sRGB</samp> chunk.</p>

    <p>The critical PNG chunks <samp>IHDR</samp>, <samp>PLTE</samp>,
    <samp>IDAT</samp>, and <samp>IEND</samp> cannot be excluded.  Any such
    entries appearing in the list will be ignored.</p>

    <p>If the ancillary PNG <samp>tRNS</samp> chunk is excluded and the
    image has transparency, the PNG colortype is forced to be 4 or 6
    (GRAY_ALPHA or RGBA).  If the image is not transparent, then the
    <samp>tRNS</samp> chunk isn't written anyhow, and there is no effect
    on the PNG colortype of the output image.</p>

    <p>The <a href="command-line-options.html#strip">-strip</a>
    option does the equivalent of the following for PNG output:</p>

    <pre class="p-3 mb-2 text-body-secondary bg-body-tertiary"><samp>-define png:exclude-chunk=EXIF,iCCP,iTXt,sRGB,tEXt,zCCP,zTXt,date</samp></pre>

    <p>The default behavior is to include all known PNG ancillary chunks
    plus ImageMagick's private <samp>vpAg</samp> ("virtual page") chunk,
    and to exclude all PNG chunks that are unknown to ImageMagick,
    regardless of their PNG "copy-safe" status as described in the
    PNG specification.</p>

    <p>Any chunk names that are not known to ImageMagick are ignored
    if they appear in either the "include-chunk" or "exclude-chunk" list.
    The ancillary chunks currently known to ImageMagick are
    <samp>bKGD</samp>, <samp>cHRM</samp>, <samp>gAMA</samp>, <samp>iCCP</samp>,
    <samp>oFFs</samp>, <samp>orNT</samp>, <samp>pHYs</samp>, <samp>sRGB</samp>, <samp>tEXt</samp>,
    <samp>tRNS</samp>, <samp>vpAg</samp>, and <samp>zTXt</samp>.</p>

    <p>You can also put <samp>date</samp> in the list to include or exclude
    the "Date:create" and "Date:modify" text chunks that ImageMagick normally
    inserts in the output PNG.</p></td>
  </tr>

  <tr>
    <td>png:ignore-crc[=<var>true</var>]</td>
    <td>When you know your image has no CRC or ADLER32 errors, this can speed
    up decoding. It is also helpful in debugging bug reports from "fuzzers".</td>
  </tr>

  <tr>
    <td>png:preserve-colormap[=<var>true</var>]</td>
    <td>Use the existing image->colormap. Normally the PNG encoder will
    try to optimize the palette, eliminating unused entries and putting
    the transparent colors first.  If this flag is set, that behavior
    is suppressed.</td>
  </tr>

  <tr>
    <td>png:preserve-iCCP[=<var>true</var>]</td>
    <td>By default, the PNG decoder and encoder examine any ICC profile
    that is present, either from an <samp>iCCP</samp> chunk in the PNG
    input or supplied via an option, and if the profile is recognized
    to be the sRGB profile, converts it to the <samp>sRGB</samp> chunk.
    You can use <samp>-define png:preserve-iCCP</samp> to prevent
    this from happening; in such cases the <samp>iCCP</samp> chunk
    will be read or written and no <samp>sRGB</samp> chunk will be
    written.  There are some ICC profiles that claim to be sRGB but
    have various errors that cause them to be rejected by libpng16; such
    profiles are recognized anyhow and converted to the <samp>sRGB</samp>
    chunk, but are rejected if the <samp>-define png:preserve-iCCP</samp>
    is present. Note that not all "sRGB" ICC profiles are recognized
    yet; we will add them to the list as we encounter them.</td>
  </tr>

  <tr>
    <td>png:swap-bytes[=<var>true</var>]</td>
    <td>The PNG specification requires that any multi-byte integers be stored
    in network byte order (MSB-LSB endian).  This option allows you to
    fix any invalid PNG files that have 16-bit samples stored incorrectly
    in little-endian order (LSB-MSB).  The "-define png:swap-bytes" option
    must appear before the input filename on the commandline.  The swapping
    is done during the libpng decoding operation.</td>
  </tr>

  <tr>
    <td>ps:imagemask</td>
    <td>If the ps:imagemask flag is defined, the PS3 and EPS3 coders will
    create Postscript files that render bilevel images with the Postscript
    imagemask operator instead of the image operator.</td>
  </tr>

  <tr>
    <td>psd:additional-info=all|selective</td>
    <td>This option should only be used when converting from a PSD file to
    another PSD file. This should be placed after the image is read. The two
    options are 'all' and 'selective'. The 'selective' option will preserve
    all additional information that is not related to the geometry of the
    image. The 'all' option should only be used when the geometry of the
    image has not been changed. This option is helpful when transferring
    non-simple layers, such as adjustment layers from the input PSD file to
    the output PSD file. If this option is not used, the additional
    information will not be preserved. This define is available as of
    Imagemagick version 6.9.5-8.
    </td>
  </tr>

  <tr>
    <td>psd:alpha-unblend=off</td>
    <td>Disable new automatic un-blending of transparency with the base image
    for the flattened layer 0 before adding the alpha channel to the output
    image. This define must be placed before the input psd image. (Available
    as of IM 6.9.2.5). The automatic un-blending is new to IM 6.9.2.5 and
    prevents the transparency from being applied twice in the output
    image. This option should be set before reading the image.</td>
  </tr>

  <tr>
    <td>psd:preserve-opacity-mask=<var>true</var></td>
    <td>This option should only be used when converting from a PSD file to
    another PSD file. It will preserve the opacity mask of a layer and add it
    back to the layer when the image is saved. Setting this to 'true' will
    enable this feature. This define is available as of Imagemagick version
    6.9.5-10.
    </td>
  </tr>

  <tr>
    <td>psd:write-layers=<var>false</var></td>
    <td>This option can be used to disable writing the layers of a PSD file.
    </td>
  </tr>

  <tr>
    <td>psd:replicate-profile=<var>true</var></td>
    <td>This option can be used to copy the image profile to all the images
    instead of only the first image that is returned.
    </td>
  </tr>

  <tr>
    <td>ptif:pyramid=<var>min-base</var>x<var>levels</var></td>
    <td>Specify the min-base and number of levels of the pyramid, e.g., 64x4.</td>
  </tr>

  <tr>
    <td>svg:embedding=<var>true</var></td>
    <td>Enable embedding of a another SVG for which you trust the source.  This is disabled by default as it can be a source of infinite recusion.</td>
  </tr>

  <tr>
    <td>svg:parse-huge=<var>true</var></td>
    <td>Enable rendering of a very large SVG for which you trust the source.</td>
  </tr>

  <tr>
    <td>svg:substitute-entities=<var>true</var></td>
    <td>Enable entity substitution if you trust the source.</td>
  </tr>

  <tr>
    <td>tga:preserve-orientation=<var>true</var></td>
    <td>Preserve the image orientation.</td>
  </tr>

  <tr>
    <td>tga:write-footer=<var>true</var></td>
    <td>Enable writing of an empty optional footer.</td>
  </tr>

  <tr>
    <td>tiff:alpha=<var>associated|unassociated|unspecified</var></td>
    <td>Specify the alpha extra samples as associated, unassociated or
    unspecified.</td>
  </tr>

  <tr>
    <td>tiff:assume-alpha=<var>true|false</var></td>
    <td>Assume undeclared extra channels are alpha.</td>
  </tr>

  <tr>
    <td>tiff:endian=<var>msb|lsb</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>tiff:exif-properties=<var>false</var></td>
    <td>Disable reading the EXIF properties.</td>
  </tr>

  <tr>
    <td>tiff:fill-order=<var>msb|lsb</var></td>
    <td> </td>
  </tr>

  <tr>
    <td>tiff:peg-tables-mode=<var>0-3</var></td>
    <td>Set the TIFFTAG_JPEGTABLESMODE when the tiff file is written with
    jpeg compression</td>
  </tr>

  <tr>
    <td>tiff:gps-properties=<var>false</var></td>
    <td>Disable reading the GPS properties.</td>
  </tr>

  <tr>
    <td>tiff:ignore-layers=<var>true</var></td>
    <td>Ignore the Photoshop layers.</td>
  </tr>

  <tr>
    <td>tiff:ignore-tags=<var>comma-separate-list-of-tag-IDs</var></td>
    <td>Allow one or more tag ID values to be ignored.</td>
  </tr>

  <tr>
    <td>tiff:predictor=<var>[1, 2 or 3]</var></td>
    <td>A mathematical operator that is applied to the image data before an
    encoding scheme is applied. The general idea is that subsequent pixels of
    an image resemble each other. Thus, substracting the information from a
    pixel that is already contained in previous one is likely to reduce its
    information density considerably and aid subsequent compression.
    1 = No prediction scheme used before coding. 2 = Horizontal differencing.
    3 = Floating point horizontal differencing.</td>
  </tr>

  <tr>
    <td>tiff:preserve-compression=<var>true</var></td>
    <td>Preserve compression of the source image.</td>
  </tr>

  <tr>
    <td>tiff:rows-per-strip=<var>value</var></td>
    <td>Set the number of rows per strip.</td>
  </tr>

  <tr>
    <td>tiff:tile-geometry=<var>WxH</var></td>
    <td>Set the tile size for pyramid tiffs. Requires the suffix
    PTIF: before the outputname.</td>
  </tr>

  <tr>
    <td>uhdr:gainmap-gamma=<var>value</var></td>
    <td>Set gainmap image encoding gamma. Must be greater than 0.0. Used during
        encoding. Optional. Default value is 1.0.</td>
  </tr>

  <tr>
    <td>uhdr:gainmap-quality=<var>value</var></td>
    <td>Set gainmap image encoding quality factor. The valid range is 1 to 100,
        with 1 indicating lowest image quality or highest compression and 100
        indicating best quality or least effective compression. Used during
        encoding. Optional. Default value is 95.</td>
  </tr>

  <tr>
    <td>uhdr:gainmap-max-content-boost=<var>value</var></td>
    <td>Specify the maximum allowed ratio of the linear luminance for the target
        HDR rendition relative to (divided by) that of the SDR image, at a given
        pixel. In other words, this specifies how much brighter a pixel can get,
        when shown on an HDR display, relative to the SDR rendition. Must be
        greater than 0.0. Used during encoding. Optional. If not configured,
        this is computed dynamically based on the input.</td>
  </tr>

  <tr>
    <td>uhdr:gainmap-min-content-boost=<var>value</var></td>
    <td>Specify the minimum allowed ratio of the linear luminance for the target
        HDR rendition relative to (divided by) that of the SDR image, at a given
        pixel. In other words, this specifies how much darker a pixel can get,
        when shown on an HDR display, relative to the SDR rendition. Must be
        greater than 0.0. Used during encoding. Optional. If not configured,
        this is computed dynamically based on the input.</td>
  </tr>

  <tr>
    <td>uhdr:hdr-color-gamut=<var>{bt709|display_p3|bt2100}</var></td>
    <td>Set input HDR intent color gamut. Used during encoding. Required.</td>
  </tr>

  <tr>
    <td>uhdr:hdr-color-transfer=<var>{hlg|pq|linear}</var></td>
    <td>Set input HDR intent color transfer. Used during encoding. Required.</td>
  </tr>

  <tr>
    <td>uhdr:output-color-transfer=<var>{hlg|pq|linear|srgb}</var></td>
    <td>Set the target display transfer characteristics on which the
        ultrahdr image is rendered. Used during decoding. Required.
        If <em>srgb</em>, only sdr intent is decoded and sent as output,
        otherwise, sdr intent and gainmap are decoded, combined into
        hdr image and sent as output.</td>
  </tr>

  <tr>
    <td>uhdr:sdr-color-gamut=<var>{bt709|display_p3|bt2100}</var></td>
    <td>Set input SDR intent color gamut. Used during encoding. Required.</td>
  </tr>

  <tr>
    <td>uhdr:uhdr:target-display-peak-brightness=<var>value</var></td>
    <td>Peak brightness refers to the maximum brightness level that a display can achieve.  This is important for accurately representing bright highlights in HDR content.</td>
  </tr>

  <tr>
    <td>video:intermediate-format=<var>{pam,webp}</var></td>
    <td>Set the video intermediate format option of <samp>ffmpeg</samp>.</td>
  </tr>

  <tr>
    <td>video:pixel-format=<var>value</var></td>
    <td>Set the pixel format option of <samp>ffmpeg</samp>.</td>
  </tr>

  <tr>
    <td>video:vsync=<var>value</var></td>
    <td>Set the vsync option of <samp>ffmpeg</samp>.</td>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <th align="center" colspan="2">PSEUDO-IMAGE FORMATS</th>
  </tr>

  <tr>
    <td>caption:max-pointsize=<var>pointsize</var></td>
   <td>Limit the maximum point size</td>
  </tr>

  <tr>
    <td>caption:split=<var>boolean</var></td>
   <td>split text if required to fit caption on canvas</td>
  </tr>

  <tr>
    <td>gradient:angle=<var>angle (in degrees)</var></td>
    <td>For a linear gradient, this specifies the direction of
    the gradient going from color1 to color2 in a clockwise
    positive manner relative to north (up). For a radial
    gradient, this specifies the rotation of the gradient in a
    clockwise positive manner from its normal X-Y orientation.
    Supported in Imagemagick 6.9.2-5.</td>
   </tr>
  <tr>
    <td>gradient:bounding-box=<var>WxH+X+Y</var></td>
    <td>Limit the gradient to a larger or smaller region than
    the image dimensions. If the region defined by the bounding
    box is smaller than the image, then color1 will be the color
    of the background.
    Supported in Imagemagick 6.9.2-5.</td>
  </tr>

  <tr>
    <td>gradient:center=<var>x,y</var></td>
    <td>Specify the coordinates of the center point for the
    radial gradient. The default is the center of the image.
    Supported in Imagemagick 6.9.2-5.</td>
  </tr>

  <tr>
    <td>gradient:direction=<var>value</var></td>
    <td>Specify the direction of the linear gradient towards
    the top/bottom/left/right or diagonal corners. The choices are:
    NorthWest, North, Northeast, West, East, SouthWest, South, SouthEast.
    Supported in Imagemagick 6.9.2-5.</td>
   </tr>

  <tr>
    <td>gradient:extent=<var>value</var></td>
    <td>Specify the shape of an image centered radial gradient.
    The choices are: Circle, Diagonal, Ellipse, Maximum, Minimum.
    Circle and Maximum draw a circular radial gradient even for
    rectangular shaped images of radius equal to the larger of
    the half-width and half-height of the image. The Circle and
    Maximum options are both equivalent to the default radial
    gradient. The Minimum option draws a circular radial gradient
    even for rectangular shaped images of radius equal to the
    smaller of the half-width and half-height of the image.
    The Diagonal option draws a circular radial gradient even
    for rectangular shaped images of radius equal to the
    half-diagonal of the image. The Ellipse options draws an
    elliptical radial gradient for rectangular shaped images of
    radii equal to half the width and half the height of the image.
    Supported in Imagemagick 6.9.2-5.</td>
   </tr>

  <tr>
    <td>gradient:radii=<var>x,y</var></td>
    <td>Specify the x and y radii of the gradient. If the
    x radius and the y radius are equal, the shape of the
    radial gradient will be a circle. If they differ, then
    the shape will be an ellipse. The default values are the
    maximum of the half width and half height of the image.
    Supported in Imagemagick 6.9.2-5.</td>
  </tr>

  <tr>
    <td>gradient:vector=<var>x1,y1,x2,y2</var></td>
    <td>Specify the direction of the linear gradient going from
    vector1 (x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be
    located at vector position x1,y1 and color2 (toColor) will be
    located at vector position x2,y2.
    Supported in Imagemagick 6.9.2-5.</td>
  </tr>

  <tr>
    <td>histogram:unique-colors=<var>false</var></td>
    <td>Suppress the textual listing of the image's unique colors.</td>
  </tr>

  <tr>
    <td>pango:align=<var>left|center|right</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:auto-dir=<var>true|false</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:ellipsize=<var>start|middle|end</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:gravity-hint=<var>natural|strong|line</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:hinting=<var>none|auto|full</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:indent=<var>points</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:justify=<var>true|false</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:language=<var>en_US|others</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:markup=<var>true|false</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:single-paragraph=<var>true|false</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pango:wrap=<var>word|char|word-char</var></td>
    <td></td>
  </tr>

  <tr>
    <td>pixel:compliance=<var>value</var></td>
    <td>Set the "pixel:" output format according to several standards.
    The choices are SVG, None, Undefined, MVG, X11, XPM. The default
    list values for (s)RGB colors in the form of (s)rgb(r,g,b) or
    (s)rgba(r,g,b,a). Color names will no longer be presented. For sRGB or
    RGB colors, the SVG, X11, XPM and None options lists color names,
    if they exist. The MVG and Undefined options list hex values. When
    colors are presented or converted to hue-based colorspaces, the values
    listed will be integers for hue and percents for the other two components.
    For other colorspaces, values may be listed as either percents or
    fractional value. Setting the depth to 8 will limit values to the 8-bit
    range, except for hue-based colors.</td>
  </tr>

  <tr>
    <td>txt:compliance=<var>value</var></td>
    <td>Set the "txt:" format for the values in parentheses according to
    several standards. The choices are svg, none, undefined, mvg, x11, xpm.
    The default will list values for (s)RGB colors in the quantum range.
    The SVG, X11, XPM, MVG and None options lists values in the 8-bit range
    for all Q-level compiles. The undefined option also lists values in the
    quantum range. When colors are presented or converted to hue-based
    colorspaces, the values listed will be integers for hue and percents for
    the other two components. For other colorspaces, values may be listed as
    either percents or fractional value. Setting the depth to 8 will limit
    values to the 8-bit range, except for hue-based colors.</td>
   </tr>

  <tr>
    <td>webp:<var>tag</var>=<var>value</var></td>
    <td>WebP has a plethora of defines detailed on this <a href="../www/webp.html">page</a>.</td>
  </tr>

  <tr>
    <td>xmp:validate=<var>{true,false}</var></td>
    <td>By default, ImageMagick validates any XMP profile embedded in an image.</td>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <th align="center" colspan="2">Identify Defines</th>
  </tr>

  <tr>
    <td colspan="2"><p></p></td>
  </tr>

  <tr>
    <td>identify:locate=<var>minimum|maximum</var></td>
   <td>Locate the coordinates of one or more image minimum or maximum.</td>
  </tr>

  <tr>
    <td>identify:limit=<var>number</var></td>
    <td>Locate the coordinates for the number of minima or maxima specified.</td>
  </tr>

</table>

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