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<title>TIFFReadRGBAImage</title>
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2005-03-06 06:11:43 -05:00
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<h1 align=center>TIFFReadRGBAImage</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="#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="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p style="margin-left:11%; margin-top: 1em">TIFFReadRGBAImage,
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TIFFReadRGBAImageOriented − read and decode an image
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into a fixed-format raster</p>
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2005-03-06 06:11:43 -05:00
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>#include
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<tiffio.h></b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>#define
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TIFFGetR(abgr) ((abgr) & 0xff) <br>
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#define TIFFGetG(abgr) (((abgr) >> 8) & 0xff) <br>
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#define TIFFGetB(abgr) (((abgr) >> 16) & 0xff)
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<br>
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#define TIFFGetA(abgr) (((abgr) >> 24) &
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0xff)</b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>int
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TIFFReadRGBAImage(TIFF *</b><i>tif</i><b>, u_long</b>
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<i>width</i><b>, u_long</b> <i>height</i><b>, u_long
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*</b><i>raster</i><b>, int</b> <i>stopOnError</i><b>) <br>
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int TIFFReadRGBAImageOriented(TIFF *</b><i>tif</i><b>,
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u_long</b> <i>width</i><b>, u_long</b> <i>height</i><b>,
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u_long *</b><i>raster</i><b>, int</b> <i>orientation</i><b>,
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int</b> <i>stopOnError</i><b>)</b></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFReadRGBAImage</i>
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reads a strip- or tile-based image into memory, storing the
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result in the user supplied <i>raster</i>. The raster is
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assumed to be an array of <i>width</i> times <i>height</i>
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32-bit entries, where <i>width</i> must be less than or
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equal to the width of the image (<i>height</i> may be any
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non-zero size). If the raster dimensions are smaller than
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the image, the image data is cropped to the raster bounds.
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If the raster height is greater than that of the image, then
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the image data are placed in the lower part of the raster.
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(Note that the raster is assume to be organized such that
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the pixel at 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 lower-left hand corner.)</p>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFReadRGBAImageOriented</i>
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works like <i>TIFFReadRGBAImage</i> with except of that user
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can specify the raster origin position with the
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<i>orientation</i> parameter. Four orientations supported:
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<b><br>
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ORIENTATION_TOPLEFT</b></p>
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<p style="margin-left:22%;">origin in top-left corner,</p>
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<p style="margin-left:11%;"><b>ORIENTATION_TOPRIGHT</b></p>
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<p style="margin-left:22%;">origin in top-right corner,</p>
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<p style="margin-left:11%;"><b>ORIENTATION_BOTLEFT</b></p>
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<p style="margin-left:22%;">origin in bottom-left corner
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and</p>
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<p style="margin-left:11%;"><b>ORIENTATION_BOTRIGHT</b></p>
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<p style="margin-left:22%;">origin in bottom-right
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corner.</p>
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<p style="margin-left:11%; margin-top: 1em">If you choose
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<b>ORIENTATION_BOTLEFT</b> result will be the same as
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returned by the <i>TIFFReadRGBAImage.</i></p>
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<p style="margin-left:11%; margin-top: 1em">Raster pixels
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are 8-bit packed red, green, blue, alpha samples. The macros
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<i>TIFFGetR</i>, <i>TIFFGetG</i>, <i>TIFFGetB</i>, and
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<i>TIFFGetA</i> should be used to access individual samples.
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Images without Associated Alpha matting information have a
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constant Alpha of 1.0 (255).</p>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFReadRGBAImage</i>
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converts non-8-bit images by scaling sample values. Palette,
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grayscale, bilevel, <small>CMYK</small> , and YCbCr images
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are converted to <small>RGB</small> transparently. Raster
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pixels are returned uncorrected by any colorimetry
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information present in the directory.</p>
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<p style="margin-left:11%; margin-top: 1em">The paramater
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<i>stopOnError</i> specifies how to act if an error is
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encountered while reading the image. If <i>stopOnError</i>
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is non-zero, then an error will terminate the operation;
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otherwise <i>TIFFReadRGBAImage</i> will continue processing
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data until all the possible data in the image have been
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requested.</p>
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2005-03-06 06:11:43 -05:00
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<p style="margin-left:11%; margin-top: 1em">In C++ the
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<i>stopOnError</i> parameter defaults to 0.</p>
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<p style="margin-left:11%; margin-top: 1em">Samples must be
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either 1, 2, 4, 8, or 16 bits. Colorimetric samples/pixel
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must be either 1, 3, or 4 (i.e. <i>SamplesPerPixel</i> minus
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<i>ExtraSamples</i>).</p>
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<p style="margin-left:11%; margin-top: 1em">Palettte image
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colormaps that appear to be incorrectly written as 8-bit
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values are automatically scaled to 16-bits.</p>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFReadRGBAImage</i>
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is just a wrapper around the more general
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<i>TIFFRGBAImage</i>(3TIFF) facilities.</p>
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
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<p style="margin-left:11%; margin-top: 1em">1 is returned
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if the image was successfully read and converted. Otherwise,
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0 is returned if an error was encountered and
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<i>stopOnError</i> is zero.</p>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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<p style="margin-left:11%; margin-top: 1em">All error
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messages are directed to the <i>TIFFError</i>(3TIFF)
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routine.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Sorry, can
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not handle %d-bit pictures</b>. The image had
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<i>BitsPerSample</i> other than 1, 2, 4, 8, or 16.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Sorry, can
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not handle %d-channel images</b>. The image had
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<i>SamplesPerPixel</i> other than 1, 3, or 4.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Missing
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needed "PhotometricInterpretation" tag</b>. The
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image did not have a tag that describes how to display the
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data.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>No
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"PhotometricInterpretation" tag, assuming RGB</b>.
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The image was missing a tag that describes how to display
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it, but because it has 3 or 4 samples/pixel, it is assumed
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to be <small>RGB.</small></p>
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<p style="margin-left:11%; margin-top: 1em"><b>No
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"PhotometricInterpretation" tag, assuming
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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
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assumed to be a grayscale or bilevel image.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>No space for
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photometric conversion table</b>. There was insufficient
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memory for a table used to convert image samples to 8-bit
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<small>RGB.</small></p>
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<p style="margin-left:11%; margin-top: 1em"><b>Missing
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required "Colormap" tag</b>. A Palette image did
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not have a required <i>Colormap</i> tag.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>No space for
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tile buffer</b>. There was insufficient memory to allocate
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an i/o buffer.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>No space for
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strip buffer</b>. There was insufficient memory to allocate
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an i/o buffer.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Can not
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handle format</b>. The image has a format (combination of
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<i>BitsPerSample</i>, <i>SamplesPerPixel</i>, and
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<i>PhotometricInterpretation</i>) that
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<i>TIFFReadRGBAImage</i> can not handle.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>No space for
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B&W mapping table</b>. There was insufficient memory to
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allocate a table used to map grayscale data to
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<small>RGB.</small></p>
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<p style="margin-left:11%; margin-top: 1em"><b>No space for
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Palette mapping table</b>. There was insufficient memory to
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allocate a table used to map data to 8-bit
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<small>RGB.</small></p>
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2005-03-06 06:11:43 -05:00
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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2006-01-02 18:50:44 -05:00
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<p style="margin-left:11%; margin-top: 1em"><b>TIFFOpen</b>(3TIFF),
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<b>TIFFRGBAImage</b>(3TIFF),
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<b>TIFFReadRGBAStrip</b>(3TIFF),
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<b>TIFFReadRGBATile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
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<p style="margin-left:11%; margin-top: 1em">Libtiff library
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home page: <b>http://www.remotesensing.org/libtiff/</b></p>
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<hr>
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</body>
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</html>
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