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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>TIFFRGBAImage</title>
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<h1 align=center>TIFFRGBAImage</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#ALTERNATE RASTER FORMATS">ALTERNATE RASTER FORMATS</a><br>
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<a href="#SIMULTANEOUS RASTER STORE AND DISPLAY">SIMULTANEOUS RASTER STORE AND DISPLAY</a><br>
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<a href="#SUPPORTING ADDITIONAL TIFF FORMATS">SUPPORTING ADDITIONAL TIFF FORMATS</a><br>
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<a href="#NOTES">NOTES</a><br>
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<a href="#RETURN VALUES">RETURN VALUES</a><br>
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<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
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<a href="#BUGS">BUGS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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2003-11-27 10:07:01 -05:00
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<!-- Creator : groff version 1.17.2 -->
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<!-- CreationDate: Thu Nov 27 17:58:04 2003 -->
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<a name="NAME"></a>
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<h2>NAME</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<td width="10%"></td><td width="90%">
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TIFFRGBAImage - read and decode an image into a raster</td></table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<pre><b>#include <tiffio.h>
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typedef unsigned char TIFFRGBValue;
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typedef struct _TIFFRGBAImage TIFFRGBAImage;
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int TIFFRGBAImageOK(TIFF* tif, char emsg[1024]);
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int TIFFRGBAImageBegin(TIFFRGBAImage* img, TIFF* tif, int stopOnError, char emsg[1024]);
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int TIFFRGBAImageGet(TIFFRGBAImage* img, uint32* raster, uint32 width, uint32 height);
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void TIFFRGBAImageEnd(TIFFRGBAImage* img);
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</b></pre></td></table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The routines described here provide a high-level interface
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through which <small>TIFF</small> images may be read into
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memory. Images may be strip- or tile-based and have a
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variety of different characteristics: bits/sample,
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samples/pixel, photometric, etc. Decoding state is
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encapsulated in a <i>TIFFRGBAImage</i> structure making it
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possible to capture state for multiple images and quickly
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switch between them. The target raster format can be
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customized to a particular application's needs by installing
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custom routines that manipulate image data according to
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application requirements.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The default usage for these routines is: check if an image
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can be processed using <i>TIFFRGBAImageOK</i>, construct a
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decoder state block using <i>TIFFRGBAImageBegin</i>, read
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and decode an image into a target raster using
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<i>TIFFRGBAImageGet</i>, and then release resources using
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<i>TIFFRGBAImageEnd</i>. <i>TIFFRGBAImageGet</i> can be
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called multiple times to decode an image using different
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state parameters. If multiple images are to be displayed and
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there is not enough space for each of the decoded rasters,
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multiple state blocks can be managed and then calls can be
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made to <i>TIFFRGBAImageGet</i> as needed to display an
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image.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The generated raster is assumed to be an array of
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<i>width</i> times <i>height</i> 32-bit entries, where
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<i>width</i> must be less than or equal to the width of the
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image (<i>height</i> may be any non-zero size). If the
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raster dimensions are smaller than the image, the image data
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is cropped to the raster bounds. If the raster height is
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greater than that of the image, then the image data are
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placed in the lower part of the raster. (Note that the
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raster is assume to be organized such that the pixel at
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location (<i>x</i>,<i>y</i>) is
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<i>raster</i>[<i>y</i>*<i>width</i>+<i>x</i>]; with the
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raster origin in the <b>lower-left</b> hand
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corner.)</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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Raster pixels are 8-bit packed red, green, blue, alpha
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samples. The macros <i>TIFFGetR</i>, <i>TIFFGetG</i>,
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<i>TIFFGetB</i>, and <i>TIFFGetA</i> should be used to
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access individual samples. Images without Associated Alpha
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matting information have a constant Alpha of 1.0
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(255).</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<i>TIFFRGBAImageGet</i> converts non-8-bit images by scaling
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sample values. Palette, grayscale, bilevel,
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<small>CMYK</small> , and YCbCr images are converted to
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<small>RGB</small> transparently. Raster pixels are returned
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uncorrected by any colorimetry information present in the
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directory.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The paramater <i>stopOnError</i> specifies how to act if an
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error is encountered while reading the image. If
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<i>stopOnError</i> is non-zero, then an error will terminate
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the operation; otherwise <i>TIFFRGBAImageGet</i> will
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continue processing data until all the possible data in the
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image have been requested.</td></table>
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<a name="ALTERNATE RASTER FORMATS"></a>
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<h2>ALTERNATE RASTER FORMATS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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To use the core support for reading and processing
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<small>TIFF</small> images, but write the resulting raster
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data in a different format one need only override the
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``<i>put methods</i>'' used to store raster data. These
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methods are are defined in the <i>TIFFRGBAImage</i>
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structure and initially setup by <i>TIFFRGBAImageBegin</i>
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to point to routines that pack raster data in the default
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<small>ABGR</small> pixel format. Two different routines are
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used according to the physical organization of the image
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data in the file: <i>PlanarConfiguration</i>=1 (packed
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samples), and <i>PlanarConfiguration</i>=2 (separated
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samples). Note that this mechanism can be used to transform
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the data before storing it in the raster. For example one
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can convert data to colormap indices for display on a
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colormap display.</td></table>
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<a name="SIMULTANEOUS RASTER STORE AND DISPLAY"></a>
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<h2>SIMULTANEOUS RASTER STORE AND DISPLAY</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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It is simple to display an image as it is being read into
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memory by overriding the put methods as described above for
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supporting alternate raster formats. Simply keep a reference
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to the default put methods setup by
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<i>TIFFRGBAImageBegin</i> and then invoke them before or
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after each display operation. For example, the
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<i>tiffgt</i>(1) utility uses the following put method to
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update the display as the raster is being
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filled:</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<pre>
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static void
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putContigAndDraw(TIFFRGBAImage* img, uint32* raster,
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uint32 x, uint32 y, uint32 w, uint32 h,
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int32 fromskew, int32 toskew,
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unsigned char* cp)
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{
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(*putContig)(img, raster, x, y, w, h, fromskew, toskew, cp);
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if (x+w == width) {
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w = width;
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if (img->orientation == ORIENTATION_TOPLEFT)
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lrectwrite(0, y-(h-1), w-1, y, raster-x-(h-1)*w);
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else
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lrectwrite(0, y, w-1, y+h-1, raster);
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}
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}
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</pre>(the original routine provided by the library is saved in the variable <i>putContig</i>.)</td></table>
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<a name="SUPPORTING ADDITIONAL TIFF FORMATS"></a>
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<h2>SUPPORTING ADDITIONAL TIFF FORMATS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The <i>TIFFRGBAImage</i> routines support the most commonly
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encountered flavors of <small>TIFF.</small> It is possible
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to extend this support by overriding the ``<i>get
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method</i>'' invoked by <i>TIFFRGBAImageGet</i> to read
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<small>TIFF</small> image data. Details of doing this are a
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bit involved, it is best to make a copy of an existing get
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method and modify it to suit the needs of an
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application.</td></table>
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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Samples must be either 1, 2, 4, 8, or 16 bits. Colorimetric
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samples/pixel must be either 1, 3, or 4 (i.e.
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<i>SamplesPerPixel</i> minus
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<i>ExtraSamples</i>).</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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Palettte image colormaps that appear to be incorrectly
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written as 8-bit values are automatically scaled to
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16-bits.</td></table>
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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All routines return 1 if the operation was successful.
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Otherwise, 0 is returned if an error was encountered and
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<i>stopOnError</i> is zero.</td></table>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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2003-11-27 10:07:01 -05:00
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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All error messages are directed to the <i>TIFFError</i>(3T)
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routine.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>Sorry, can not handle %d-bit pictures</b>. The image had
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<i>BitsPerSample</i> other than 1, 2, 4, 8, or
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16.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>Sorry, can not handle %d-channel images</b>. The image
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had <i>SamplesPerPixel</i> other than 1, 3, or
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4.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>Missing needed "PhotometricInterpretation"
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2002-10-07 09:47:36 -04:00
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tag</b>. The image did not have a tag that describes how to
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2003-11-27 10:07:01 -05:00
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display the data.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>No "PhotometricInterpretation" tag, assuming
|
2002-10-07 09:47:36 -04:00
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RGB</b>. The image was missing a tag that describes how to
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display it, but because it has 3 or 4 samples/pixel, it is
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2003-11-27 10:07:01 -05:00
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assumed to be <small>RGB.</small></td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>No "PhotometricInterpretation" tag, assuming
|
2002-10-07 09:47:36 -04:00
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min-is-black</b>. The image was missing a tag that describes
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how to display it, but because it has 1 sample/pixel, it is
|
2003-11-27 10:07:01 -05:00
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assumed to be a grayscale or bilevel image.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>No space for photometric conversion table</b>. There was
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insufficient memory for a table used to convert image
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|
samples to 8-bit <small>RGB.</small></td></table>
|
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
|
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<td width="10%"></td><td width="90%">
|
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|
<b>Missing required "Colormap" tag</b>. A Palette
|
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image did not have a required <i>Colormap</i>
|
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tag.</td></table>
|
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
|
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<tr valign="top" align="left">
|
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<td width="10%"></td><td width="90%">
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|
<b>No space for tile buffer</b>. There was insufficient
|
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|
|
memory to allocate an i/o buffer.</td></table>
|
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|
<table width="100%" border=0 rules="none" frame="void"
|
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|
cols="2" cellspacing="0" cellpadding="0">
|
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|
<tr valign="top" align="left">
|
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|
<td width="10%"></td><td width="90%">
|
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|
<b>No space for strip buffer</b>. There was insufficient
|
|
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|
|
memory to allocate an i/o buffer.</td></table>
|
|
|
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|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
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|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
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|
|
<tr valign="top" align="left">
|
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|
|
<td width="10%"></td><td width="90%">
|
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|
|
<b>Can not handle format</b>. The image has a format
|
2002-10-07 09:47:36 -04:00
|
|
|
(combination of <i>BitsPerSample</i>,
|
|
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|
|
<i>SamplesPerPixel</i>, and
|
|
|
|
|
<i>PhotometricInterpretation</i>) that can not be
|
2003-11-27 10:07:01 -05:00
|
|
|
handled.</td></table>
|
|
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|
|
|
|
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|
<table width="100%" border=0 rules="none" frame="void"
|
|
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|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="10%"></td><td width="90%">
|
|
|
|
|
<b>No space for B&W mapping table</b>. There was
|
2002-10-07 09:47:36 -04:00
|
|
|
insufficient memory to allocate a table used to map
|
2003-11-27 10:07:01 -05:00
|
|
|
grayscale data to <small>RGB.</small></td></table>
|
|
|
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
|
|
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="10%"></td><td width="90%">
|
|
|
|
|
<b>No space for Palette mapping table</b>. There was
|
2002-10-07 09:47:36 -04:00
|
|
|
insufficient memory to allocate a table used to map data to
|
2003-11-27 10:07:01 -05:00
|
|
|
8-bit <small>RGB.</small></td></table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="BUGS"></a>
|
|
|
|
|
<h2>BUGS</h2>
|
2003-11-27 10:07:01 -05:00
|
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2002-10-07 09:47:36 -04:00
|
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
2003-11-27 10:07:01 -05:00
|
|
|
<td width="10%"></td><td width="90%">
|
|
|
|
|
Orientations other than bottom-left, or top-left are not
|
|
|
|
|
handled correctly.</td></table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<a name="SEE ALSO"></a>
|
|
|
|
|
<h2>SEE ALSO</h2>
|
2003-11-27 10:07:01 -05:00
|
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2002-10-07 09:47:36 -04:00
|
|
|
cols="2" cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
2003-11-27 10:07:01 -05:00
|
|
|
<td width="10%"></td><td width="90%">
|
|
|
|
|
<i>libtiff</i>(3T), <i>TIFFOpen</i>(3T),
|
2002-10-07 09:47:36 -04:00
|
|
|
<i>TIFFReadRGBAImage</i>(3T), <i>TIFFReadRGBAStrip</i>(3T),
|
2003-11-27 10:07:01 -05:00
|
|
|
<i>TIFFReadRGBATile</i>(3T)</td></table>
|
2002-10-07 09:47:36 -04:00
|
|
|
<hr>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
