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\section{Enumerations}
\scriptsize{
\begin{verbatim}
Contents
* ChannelType
* ClassType
* ColorspaceType
* CompositeOperator
* CompressionType
* DecorationType
* FillRule
* FilterTypes
* GravityType
* ImageType
* InterlaceType
* LayerType
* LineCap
* LineJoin
* NoiseType
* PaintMethod
* QuantumTypes
* RenderingIntent
* ResolutionType
* StorageType
* StretchType
* StyleType
ChannelType
ChannelType is used as an argument when doing color separations. Use
ChannelType when extracting a layer from an image. MatteChannel is useful
for extracting the opacity values from an image.
ChannelType
Enumeration Description
UndefinedChannel Unset value.
RedChannel Select red channel
GreenChannel Select green channel
BlueChannel Select blue channel
MatteChannel Select matte (opacity values) channel
ClassType
ClassType specifies the image storage class.
ClassType
Enumeration Description
UndefinedClassUnset value.
DirectClass Image is composed of pixels which represent literal color
values.
PseudoClass Image is composed of pixels which specify an index in a
color palette.
ColorspaceType
The ColorspaceType enumeration is used to specify the colorspace that
quantization (color reduction and mapping) is done under or to specify the
colorspace when encoding an output image. Colorspaces are ways of describing
colors to fit the requirements of a particular application (e.g. Television,
offset printing, color monitors). Color reduction, by default, takes place
in the RGBColorspace. Empirical evidence suggests that distances in color
spaces such as YUVColorspace or YIQColorspace correspond to perceptual color
differences more closely han do distances in RGB space. These color spaces
may give better results when color reducing an image. Refer to quantize for
more details.
When encoding an output image, the colorspaces RGBColorspace,
CMYKColorspace, and GRAYColorspace may be specified. The CMYKColorspace
option is only applicable when writing TIFF, JPEG, and Adobe Photoshop
bitmap (PSD) files.
ColorspaceType
Enumeration Description
UndefinedColorspace Unset value.
RGBColorspace Red-Green-Blue colorspace.
GRAYColorspace Grayscale colorspace
The Transparent color space behaves uniquely in that
TransparentColorspaceit preserves the matte channel of the image if it
exists.
OHTAColorspace
XYZColorspace
YCbCrColorspace
YCCColorspace
YIQColorspace
YPbPrColorspace
Y-signal, U-signal, and V-signal colorspace. YUV is
YUVColorspace most widely used to encode color for use in
television transmission.
Cyan-Magenta-Yellow-Black colorspace. CYMK is a
CMYKColorspace subtractive color system used by printers and
photographers for the rendering of colors with ink or
emulsion, normally on a white surface.
sRGBColorspace
CompositeOperator
CompositeOperator is used to select the image composition algorithm used to
compose a composite image with an image. By default, each of the composite
image pixels are replaced by the corresponding image tile pixel. Specify
CompositeOperator to select a different algorithm.
CompositeOperator
Enumeration Description
UndefinedCompositeOp Unset value.
The result is the union of the the two image shapes
OverCompositeOp with the composite image obscuring image in the
region of overlap.
The result is a simply composite image cut by the
InCompositeOp shape of image. None of the image data of image is
included in the result.
OutCompositeOp The resulting image is composite image with the
shape of image cut out.
The result is the same shape as image image, with
composite image obscuring image there the image
AtopCompositeOp shapes overlap. Note that this differs from
OverCompositeOp because the portion of composite
image outside of image's shape does not appear in
the result.
The result is the image data from both composite
XorCompositeOp image and image that is outside the overlap region.
The overlap region will be blank.
The result is just the sum of the image data.
PlusCompositeOp Output values are cropped to 255 (no overflow). This
operation is independent of the matte channels.
The result of composite image - image, with overflow
MinusCompositeOp cropped to zero. The matte chanel is ignored (set to
255, full coverage).
AddCompositeOp The result of composite image + image, with overflow
wrapping around (mod 256).
The result of composite image - image, with
SubtractCompositeOp underflow wrapping around (mod 256). The add and
subtract operators can be used to perform reverible
transformations.
DifferenceCompositeOp The result of abs(composite image - image). This is
useful for comparing two very similar images.
MultiplyCompositeOp
BumpmapCompositeOp The result image shaded by composite image.
CopyCompositeOp The resulting image is image replaced with composite
image. Here the matte information is ignored.
The resulting image is the red layer in image
CopyRedCompositeOp replaced with the red layer in composite image. The
other layers are copied untouched.
The resulting image is the green layer in image
CopyGreenCompositeOp replaced with the green layer in composite image.
The other layers are copied untouched.
The resulting image is the blue layer in image
CopyBlueCompositeOp replaced with the blue layer in composite image. The
other layers are copied untouched.
The resulting image is the matte layer in image
replaced with the matte layer in composite image.
The other layers are copied untouched.
The image compositor requires a matte, or alpha
channel in the image for some operations. This extra
channel usually defines a mask which represents a
CopyOpacityCompositeOpsort of a cookie-cutter for the image. This is the
case when matte is 255 (full coverage) for pixels
inside the shape, zero outside, and between zero and
255 on the boundary. For certain operations, if
image does not have a matte channel, it is
initialized with 0 for any pixel matching in color
to pixel location (0,0), otherwise 255 (to work
properly borderWidth must be 0).
ClearCompositeOp
DissolveCompositeOp
DisplaceCompositeOp
ModulateCompositeOp
ThresholdCompositeOp
CompressionType
CompressionType is used to express the desired compression type when
encoding an image. Be aware that most image types only support a sub-set of
the available compression types. If the compression type specified is
incompatable with the image, ImageMagick selects a compression type
compatable with the image type.
CompressionType
Enumeration Description
UndefinedCompression Unset value.
NoCompression No compression
BZip (Burrows-Wheeler block-sorting text
BZipCompression compression algorithm and Huffman coding) as
used by bzip2 utilities
FaxCompression CCITT Group 3 FAX compression
Group4Compression CCITT Group 4 FAX compression (used only for
TIFF)
JPEGCompression JPEG compression
LZWCompression Lempel-Ziv-Welch (LZW) compression (caution,
patented by Unisys)
RunlengthEncodedCompressionRun-Length encoded (RLE) compression
ZipCompression Lempel-Ziv compression (LZ77) as used in PKZIP
and GNU gzip.
DecorationType
The DecorationType enumerations are used to specify line decorations of
rendered text.
DecorationType
Enumeration Description
NoDecoration No decoration
UnderlineDecoration Underlined text
OverlineDecoration Overlined text
LineThroughDecoration Strike-through text
EndianType
The EndianType enumerations are used to specify the endian option for
formats which support it (e.g. TIFF).
EndianType
Enumeration Description
UndefinedEndian Not defined (default)
LSBEndian Little endian (like Intel X86 and DEC Alpha)
MSBEndian Big endian (like Motorola 68K, Mac PowerPC, & SPARC)
FillRule
FillRule specifies the algorithm which is to be used to determine what parts
of the canvas are included inside the shape. See the documentation on SVG's
fill-rule property for usage details.
FillRule
UndefinedRule Fill rule not specified
EvenOddRule See SVG fill-rule evenodd rule.
NonZeroRule See SVG fill-rule nonzero rule.
FilterTypes
FilterTypes is used to adjust the filter algorithm used when resizing
images. Different filters experience varying degrees of success with various
images and can take sipngicantly different amounts of processing time.
ImageMagick uses the LanczosFilter by default since this filter has been
shown to provide the best results for most images in a reasonable amount of
time. Other filter types (e.g. TriangleFilter) may execute much faster but
may show artifacts when the image is re-sized or around diagonal lines. The
only way to be sure is to test the filter with sample images.
FilterTypes
Enumeration Description
UndefinedFilter Unset value.
PointFilter Point Filter
BoxFilter Box Filter
TriangleFilter Triangle Filter
HermiteFilter Hermite Filter
HanningFilter Hanning Filter
HammingFilter Hamming Filter
BlackmanFilter Blackman Filter
GaussianFilter Gaussian Filter
QuadraticFilter Quadratic Filter
CubicFilter Cubic Filter
CatromFilter Catrom Filter
MitchellFilter Mitchell Filter
LanczosFilter Lanczos Filter
BesselFilter Bessel Filter
SincFilter Sinc Filter
GravityType
GravityType specifies positioning of an object (e.g. text, image) within a
bounding region (e.g. an image). Gravity provides a convenient way to locate
objects irrespective of the size of the bounding region, in other words, you
don't need to provide absolute coordinates in order to position an object. A
common default for gravity is NorthWestGravity.
GravityType
Enumeration Description
ForgetGravity Don't use gravity.
NorthWestGravity Position object at top-left of region.
NorthGravity Postiion object at top-center of region
NorthEastGravity Position object at top-right of region
WestGravity Position object at left-center of region
CenterGravity Position object at center of region
EastGravity Position object at right-center of region
SouthWestGravity Position object at left-bottom of region
SouthGravity Position object at bottom-center of region
SouthEastGravity Position object at bottom-right of region
ImageType
ImageType indicates the type classification of the image.
ImageType
Enumeration Description
UndefinedType Unset value.
BilevelType Monochrome image
GrayscaleType Grayscale image
GrayscaleMatteType Grayscale image with opacity
PaletteType Indexed color (palette) image
PaletteMatteType Indexed color (palette) image with opacity
TrueColorType Truecolor image
TrueColorMatteType Truecolor image with opacity
ColorSeparationType Cyan/Yellow/Magenta/Black (CYMK) image
InterlaceType
InterlaceType specifies the ordering of the red, green, and blue pixel
information in the image. Interlacing is usually used to make image
information available to the user faster by taking advantage of the space vs
time tradeoff. For example, interlacing allows images on the Web to be
recognizable sooner and satellite images to accumulate/render with image
resolution increasing over time.
Use LineInterlace or PlaneInterlace to create an interlaced GIF or
progressive JPEG image.
InterlaceType
Enumeration Description
UndefinedInterlaceUnset value.
NoInterlace Don't interlace image (RGBRGBRGBRGBRGBRGB...)
LineInterlace Use scanline interlacing
(RRR...GGG...BBB...RRR...GGG...BBB...)
PlaneInterlace Use plane interlacing (RRRRRR...GGGGGG...BBBBBB...)
Similar to plane interlaing except that the different
PartitionInterlaceplanes are saved to individual files (e.g. image.R,
image.G, and image.B)
LayerType
LayerType is used as an argument when doing color separations. Use LayerType
when extracting a layer from an image. MatteLayer is useful for extracting
the opacity values from an image.
LayerType
Enumeration Description
UndefinedLayer Unset value.
RedLayer Select red layer
GreenLayer Select green layer
BlueLayer Select blue layer
MatteLayer Select matte (opacity values) layer
LineCap
The LineCap enumerations specify shape to be used at the end of open
subpaths when they are stroked. See SVG's 'stroke-linecap' for examples.
LineCap
Enumeration Description
UndefinedCapUnset value.
ButtCap Square ending.
RoundCap Rounded ending (half-circle end with radius of 1/2 stroke
width).
SquareCap Square ending, extended by 1/2 the stroke width at end.
LineJoin
The LineJoin enumerations specify the shape to be used at the corners of
paths or basic shapes when they are stroked. See SVG's 'stroke-linejoin' for
examples.
ChannelType
Enumeration Description
UndefinedJoin Unset value.
MiterJoin Sharp-edged join
RoundJoin Rounded-edged join
BevelJoin Beveled-edged join
NoiseType
NoiseType is used as an argument to select the type of noise to be added to
the image.
NoiseType
Enumeration Description
UniformNoise Uniform noise
GaussianNoise Gaussian noise
MultiplicativeGaussianNoise Multiplicative Gaussian noise
ImpulseNoise Impulse noise
LaplacianNoise Laplacian noise
PoissonNoise Poisson noise
PaintMethod
PaintMethod specifies how pixel colors are to be replaced in the image. It
is used to select the pixel-filling algorithm employed.
PaintMethod
Enumeration Description
PointMethod Replace pixel color at point.
ReplaceMethod Replace color for all image pixels matching color at
point.
FloodfillMethod Replace color for pixels surrounding point until
encountering pixel that fails to match color at point.
FillToBorderMethodReplace color for pixels surrounding point until
encountering pixels matching border color.
ResetMethod Replace colors for all pixels in image with pen color.
QuantumTypes
QuantumTypes is used to indicate the source or destination format of entire
pixels, or components of pixels ("Quantums") while they are being read, or
written to, a pixel cache. The validity of these format specifications
depends on whether the Image pixels are in RGB format, RGBA format, or CMYK
format. The pixel Quantum size is determined by the Image depth (eight or
sixteen bits).
RGB(A) Image Quantums
Enumeration Description
IndexQuantum PseudoColor colormap indices (valid
only for image with colormap)
RedQuantum Red pixel Quantum
GreenQuantum Green pixel Quantum
BlueQuantum Blue pixel Quantum
OpacityQuantum Opacity (Alpha) Quantum
CMY(K) Image Quantum
Enumeration Description
CyanQuantum Cyan pixel Quantum
MagentaQuantum Magenta pixel Quantum
YellowQuantum Yellow pixel Quantum
BlackQuantum Black pixel Quantum
Grayscale Image Quantums
Enumeration Description
GrayQuantum Gray pixel
GrayOpacityQuantum Pixel opacity
Entire Pixels (Expressed in Byte Order)
Enumeration Description
RGBQuantum RGB pixel (24 or 48 octets)
RGBAQuantum RGBA pixel (32 or 64 octets)
CMYKQuantum CMYK pixel (32 or 64 octets)
RenderingIntent
Rendering intent is a concept defined by ICC Spec ICC.1:1998-09, "File
Format for Color Profiles". ImageMagick uses RenderingIntent in order to
support ICC Color Profiles.
From the specification: "Rendering intent specifies the style of
reproduction to be used during the evaluation of this profile in a sequence
of profiles. It applies specifically to that profile in the sequence and not
to the entire sequence. Typically, the user or application will set the
rendering intent dynamically at runtime or embedding time."
RenderingIntent
Enumeration Description
UndefinedIntent Unset value.
A rendering intent that specifies the saturation of the
SaturationIntentpixels in the image is preserved perhaps at the expense of
accuracy in hue and lightness.
A rendering intent that specifies the full gamut of the
PerceptualIntentimage is compressed or expanded to fill the gamut of the
destination device. Gray balance is preserved but
colorimetric accuracy might not be preserved.
AbsoluteIntent Absolute colorimetric
RelativeIntent Relative colorimetric
ResolutionType
By default, ImageMagick defines resolutions in pixels per inch.
ResolutionType provides a means to adjust this.
ResolutionType
Enumeration Description
UndefinedResolution Unset value.
PixelsPerInchResolution Density specifications are specified in units
of pixels per inch (english units).
PixelsPerCentimeterResolutionDensity specifications are specified in units
of pixels per centimeter (metric units).
StorageType
The StorageType enumerations are used to specify the storage format of
pixels in the source or destination pixel array.
StorageType
Enumeration Description
CharPixel Character type
ShortPixel Short type
IntegerPixel Integer type
FloatPixel Float type
DoublePixel Double type
StretchType
The StretchType enumerations are used to specify the relative width of a
font to the regular width for the font family. If the width is not
important, the AnyStretch enumeration may be specified for a wildcard match.
StretchType
Enumeration Description
AnyStretch Wildcard match for font stretch
NormalStretch Normal width font
UltraCondensedStretch Ultra-condensed (narrowest) font
ExtraCondensedStretch Extra-condensed font
CondensedStretch Condensed font
SemiCondensedStretch Semi-Condensed font
SemiExpandedStretch Semi-Expanded font
ExpandedStretch Expanded font
ExtraExpandedStretch Extra-Expanded font
UltraExpandedStretch Ultra-expanded (widest) font
StyleType
The StyleType enumerations are used to specify the style (e.g. Italic) of a
font. If the style is not important, the AnyStyle enumeration may be
specified for a wildcard match.
StyleType
Enumeration Description
AnyStyle Wildcard match for font style
NormalStyle Normal font style
ItalicStyle Italic font style
ObliqueStyle Oblique font style
\end{verbatim}
}
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