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<title>TIFFReadRGBAStrip</title>
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<body>
<h1 align=center>TIFFReadRGBAStrip</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#RETURN VALUES">RETURN VALUES</a><br>
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
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<!-- CreationDate: Mon Dec 22 00:39:24 2003 -->
<a name="NAME"></a>
<h2>NAME</h2>
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TIFFReadRGBAStrip - read and decode an image strip into a fixed-format raster</td></table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<pre><b>#include <tiffio.h>
#define TIFFGetR(abgr) ((abgr) & 0xff)
#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff)
#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)
#define TIFFGetA(abgr) (((abgr) >> 24) & 0xff)
int TIFFReadRGBAStrip(TIFF* tif, uint32 row, uint32 * raster )
</b></pre></td></table>
<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<i>TIFFReadRGBAStrip</i> reads a single strip of a
strip-based image into memory, storing the result in the
user supplied RGBA <i>raster</i>. The raster is assumed to
be an array of width times rowsperstrip 32-bit entries,
where width is the width of the image (TIFFTAG_IMAGEWIDTH)
and rowsperstrip is the maximum lines in a strip
(TIFFTAG_ROWSPERSTRIP).</td></table>
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The <i>row</i> value should be the row of the first row in
the strip (strip * rowsperstrip, zero based).</td></table>
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Note that the raster is assume to be organized such that the
pixel at location (<i>x</i>,<i>y</i>) is
<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
raster origin in the <i>lower-left hand corner</i> of the
strip. That is bottom to top organization. When reading a
partial last strip in the file the last line of the image
will begin at the beginning of the buffer.</td></table>
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Raster pixels are 8-bit packed red, green, blue, alpha
samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
access individual samples. Images without Associated Alpha
matting information have a constant Alpha of 1.0
(255).</td></table>
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See the <i>TIFFRGBAImage</i>(3T) page for more details on
how various image types are converted to RGBA
values.</td></table>
<a name="NOTES"></a>
<h2>NOTES</h2>
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Samples must be either 1, 2, 4, 8, or 16 bits. Colorimetric
samples/pixel must be either 1, 3, or 4 (i.e.
<i>SamplesPerPixel</i> minus
<i>ExtraSamples</i>).</td></table>
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Palette image colormaps that appear to be incorrectly
written as 8-bit values are automatically scaled to
16-bits.</td></table>
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<i>TIFFReadRGBAStrip</i> is just a wrapper around the more
general <i>TIFFRGBAImage</i>(3T) facilities. It's main
advantage over the similar <i>TIFFReadRGBAImage()</i>
function is that for large images a single buffer capable of
holding the whole image doesn't need to be allocated, only
enough for one strip. The <i>TIFFReadRGBATile()</i> function
does a similar operation for tiled images.</td></table>
<a name="RETURN VALUES"></a>
<h2>RETURN VALUES</h2>
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1 is returned if the image was successfully read and
converted. Otherwise, 0 is returned if an error was
encountered.</td></table>
<a name="DIAGNOSTICS"></a>
<h2>DIAGNOSTICS</h2>
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All error messages are directed to the <i>TIFFError</i>(3T)
routine.</td></table>
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<b>Sorry, can not handle %d-bit pictures</b>. The image had
<i>BitsPerSample</i> other than 1, 2, 4, 8, or
16.</td></table>
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<b>Sorry, can not handle %d-channel images</b>. The image
had <i>SamplesPerPixel</i> other than 1, 3, or
4.</td></table>
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<b>Missing needed "PhotometricInterpretation"
tag</b>. The image did not have a tag that describes how to
display the data.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No "PhotometricInterpretation" tag, assuming
RGB</b>. The image was missing a tag that describes how to
display it, but because it has 3 or 4 samples/pixel, it is
assumed to be <small>RGB.</small></td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No "PhotometricInterpretation" tag, assuming
min-is-black</b>. The image was missing a tag that describes
how to display it, but because it has 1 sample/pixel, it is
assumed to be a grayscale or bilevel image.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No space for photometric conversion table</b>. There was
insufficient memory for a table used to convert image
samples to 8-bit <small>RGB.</small></td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>Missing required "Colormap" tag</b>. A Palette
image did not have a required <i>Colormap</i>
tag.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No space for tile buffer</b>. There was insufficient
memory to allocate an i/o buffer.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No space for strip buffer</b>. There was insufficient
memory to allocate an i/o buffer.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>Can not handle format</b>. The image has a format
(combination of <i>BitsPerSample</i>,
<i>SamplesPerPixel</i>, and
<i>PhotometricInterpretation</i>) that
<i>TIFFReadRGBAImage</i> can not handle.</td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No space for B&W mapping table</b>. There was
insufficient memory to allocate a table used to map
grayscale data to <small>RGB.</small></td></table>
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cols="2" cellspacing="0" cellpadding="0">
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<b>No space for Palette mapping table</b>. There was
insufficient memory to allocate a table used to map data to
8-bit <small>RGB.</small></td></table>
<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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<i>libtiff</i>(3T), <i>TIFFOpen</i>(3T),
<i>TIFFRGBAImage</i>(3T), <i>TIFFReadRGBAImage</i>(3T),
<i>TIFFReadRGBATile</i>(3T)</td></table>
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