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<!-- Creator : groff version 1.18.1 -->
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<!-- CreationDate: Mon Mar 13 18:03:08 2006 -->
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<html>
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<head>
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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>COLOR</title>
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</head>
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<body>
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<h1 align=center>COLOR</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="#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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<td width="8%"></td>
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<td width="91%">
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<p>TIFFYCbCrToRGBInit, TIFFYCbCrtoRGB, TIFFCIELabToRGBInit,
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TIFFCIELabToXYZ, TIFFXYZToRGB − color conversion
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routines.</p>
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</td>
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</table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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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="8%"></td>
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<td width="91%">
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<p><b>#include <tiffio.h></b></p>
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<p><b>int TIFFYCbCrToRGBInit(TIFFYCbCrToRGB
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*</b><i>ycbcr</i><b>, float *</b><i>luma</i><b>, float
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*</b><i>refBlackWhite"</i><b>);"<br>
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void TIFFYCbCrtoRGB(TIFFYCbCrToRGB *</b><i>ycbcr</i><b>,
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uint32</b> <i>Y</i><b>, int32</b> <i>Cb</i><b>, int32</b>
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<i>Cr</i><b>, uint32 *</b><i>R</i><b>, uint32
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*</b><i>G</i><b>, uint32 *</b><i>B</i> <b>);</b></p>
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<p><b>int TIFFCIELabToRGBInit(TIFFCIELabToRGB
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*</b><i>cielab</i><b>, TIFFDisplay *</b><i>display</i><b>,
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float *</b><i>refWhite</i><b>);<br>
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void TIFFCIELabToXYZ(TIFFCIELabToRGB *</b><i>cielab</i><b>,
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uint32</b> <i>L</i><b>, int32</b> <i>a</i><b>, int32</b>
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<i>b</i><b>, float *</b><i>X</i><b>, float *</b><i>Y</i><b>,
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float *</b><i>Z</i><b>);<br>
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void TIFFXYZToRGB(TIFFCIELabToRGB *</b><i>cielab</i><b>,
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float</b> <i>X</i><b>, float</b> <i>Y</i><b>, float</b>
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<i>Z"</i><b>,</b><i>uint32</i><b>*"</b><i>R</i><b>,
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uint32 *</b><i>G</i><b>, uint32 *</b><i>B</i><b>);</b></p>
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</td>
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</table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<tr valign="top" align="left">
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<td width="8%"></td>
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<td width="91%">
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<p>TIFF supports several color spaces for images stored in
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that format. There is usually a problem of application to
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handle the data properly and convert between different
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colorspaces for displaying and printing purposes. To
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simplify this task libtiff implements several color
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conversion routines itself. In particular, these routines
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used in <b>TIFFRGBAImage(3TIFF)</b> interface.</p>
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<p><b>TIFFYCbCrToRGBInit()</b> used to initialize
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<i>YCbCr</i> to <i>RGB</i> conversion state. Allocating and
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freeing of the <i>ycbcr</i> structure belongs to programmer.
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<i>TIFFYCbCrToRGB</i> defined in <b>tiffio.h</b> as</p>
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</td>
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</table>
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<td width="17%"></td>
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<td width="82%">
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<pre>typedef struct { /* YCbCr->RGB support */
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TIFFRGBValue* clamptab; /* range clamping table */
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</pre>
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</td>
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</table>
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<p>int*</p>
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<td width="-3%"></td>
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<td width="12%"></td>
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<td width="6%">
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<p>Cr_r_tab;<br>
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int*</p>
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</td>
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</td>
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<tr valign="top" align="left">
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<td width="28%"></td>
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<td width="-3%"></td>
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<td width="12%"></td>
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<td width="6%">
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<p>Cb_b_tab;<br>
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int32*</p>
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</td>
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<td width="56%">
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</td>
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<td width="28%"></td>
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<td width="12%"></td>
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<td width="6%">
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<p>Cr_g_tab;<br>
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int32*</p>
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<td width="56%">
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</td>
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<td width="28%"></td>
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<td width="-3%"></td>
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<td width="12%"></td>
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<td width="6%">
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<p>Cb_g_tab;</p>
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</td>
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<td width="56%">
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</td>
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</table>
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<td width="82%">
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<p>int32* Y_tab;<br>
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} TIFFYCbCrToRGB;</p></td>
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</table>
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<td width="8%"></td>
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<td width="91%">
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<p><i>luma</i> is a float array of three values representing
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proportions of the red, green and blue in luminance, Y (see
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section 21 of the TIFF 6.0 specification, where the YCbCr
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images discussed). <i>TIFFTAG_YCBCRCOEFFICIENTS</i> holds
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that values in TIFF file. <i>refBlackWhite</i> is a float
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array of 6 values which specifies a pair of headroom and
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footroom image data values (codes) for each image component
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(see section 20 of the TIFF 6.0 specification where the
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colorinmetry fields discussed).
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<i>TIFFTAG_REFERENCEBLACKWHITE</i> is responsible for
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storing these values in TIFF file. Following code snippet
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should helps to understand the the technique:</p>
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</td>
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</table>
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<td width="82%">
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<pre>float *luma, *refBlackWhite;
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uint16 hs, vs;
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/* Initialize structures */
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ycbcr = (TIFFYCbCrToRGB*)
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</pre>
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</td>
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</table>
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<td width="24%"></td>
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<td width="75%">
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<p>_TIFFmalloc(TIFFroundup(sizeof(TIFFYCbCrToRGB),
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sizeof(long))</p>
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</td>
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<td width="24%"></td>
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<td width="75%">
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<p>+ 4*256*sizeof(TIFFRGBValue)</p>
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</td>
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<td width="24%"></td>
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<td width="75%">
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<p>+ 2*256*sizeof(int)</p>
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</td>
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<td width="24%"></td>
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<p>+ 3*256*sizeof(int32));</p>
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</td>
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</table>
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<td width="17%"></td>
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<td width="82%">
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<p>if (ycbcr == NULL) {<br>
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TIFFError("YCbCr->RGB",</p></td>
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</table>
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<table width="100%" border=0 rules="none" frame="void"
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<td width="24%"></td>
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<td width="6%">
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</td>
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<td width="6%">
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<p>"No space for YCbCr->RGB conversion
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state");</p>
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</td>
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<td width="62%">
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</td>
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</table>
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<p>exit(0);<br>
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}</p>
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<p>TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRCOEFFICIENTS,
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&luma);<br>
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TIFFGetFieldDefaulted(tif, TIFFTAG_REFERENCEBLACKWHITE,
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&refBlackWhite);<br>
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if (TIFFYCbCrToRGBInit(ycbcr, luma, refBlackWhite) <
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0)</p></td>
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</table>
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<td width="24%"></td>
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<td width="75%">
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<p>exit(0);</p>
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</td>
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</table>
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<td width="82%">
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<p>/* Start conversion */<br>
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uint32 r, g, b;<br>
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uint32 Y;<br>
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int32 Cb, Cr;</p>
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<p>for each pixel in image</p></td>
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</table>
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<table width="100%" border=0 rules="none" frame="void"
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<td width="24%"></td>
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<td width="75%">
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<p>TIFFYCbCrtoRGB(img->ycbcr, Y, Cb, Cr, &r, &g,
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&b);</p>
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</td>
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</table>
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<td width="17%"></td>
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<td width="82%">
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<p>/* Free state structure */<br>
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_TIFFfree(ycbcr);</p></td>
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</table>
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<td width="8%"></td>
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<td width="91%">
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<p><b>TIFFCIELabToRGBInit()</b> initializes the <i>CIE
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L*a*b* 1976</i> to <i>RGB</i> conversion state.
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<b>TIFFCIELabToRGB</b> defined as</p>
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</td>
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</table>
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<td width="17%"></td>
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<td width="82%">
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<pre>#define CIELABTORGB_TABLE_RANGE 1500
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</pre>
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</td>
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</table>
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327 |
<tr valign="top" align="left">
|
|
|
328 |
<td width="17%"></td>
|
|
|
329 |
<td width="6%">
|
|
|
330 |
|
|
|
331 |
<p>typedef struct {</p>
|
|
|
332 |
</td>
|
|
|
333 |
<td width="6%"></td>
|
|
|
334 |
<td width="6%"></td>
|
|
|
335 |
<td width="6%"></td>
|
|
|
336 |
<td width="6%">
|
|
|
337 |
</td>
|
|
|
338 |
<td width="6%">
|
|
|
339 |
|
|
|
340 |
<p>/* CIE Lab 1976->RGB support */</p>
|
|
|
341 |
</td>
|
|
|
342 |
<td width="6%"></td>
|
|
|
343 |
<td width="37%">
|
|
|
344 |
</td>
|
|
|
345 |
<tr valign="top" align="left">
|
|
|
346 |
<td width="17%"></td>
|
|
|
347 |
<td width="6%">
|
|
|
348 |
</td>
|
|
|
349 |
<td width="6%">
|
|
|
350 |
|
|
|
351 |
<p>int</p>
|
|
|
352 |
</td>
|
|
|
353 |
<td width="6%">
|
|
|
354 |
|
|
|
355 |
<p>range;</p>
|
|
|
356 |
</td>
|
|
|
357 |
<td width="6%"></td>
|
|
|
358 |
<td width="6%">
|
|
|
359 |
</td>
|
|
|
360 |
<td width="6%">
|
|
|
361 |
|
|
|
362 |
<p>/* Size of conversion table */</p>
|
|
|
363 |
</td>
|
|
|
364 |
<td width="6%"></td>
|
|
|
365 |
<td width="37%">
|
|
|
366 |
</td>
|
|
|
367 |
<tr valign="top" align="left">
|
|
|
368 |
<td width="17%"></td>
|
|
|
369 |
<td width="6%">
|
|
|
370 |
</td>
|
|
|
371 |
<td width="6%">
|
|
|
372 |
|
|
|
373 |
<p>float</p>
|
|
|
374 |
</td>
|
|
|
375 |
<td width="6%"></td>
|
|
|
376 |
<td width="6%">
|
|
|
377 |
|
|
|
378 |
<p>rstep, gstep, bstep;</p>
|
|
|
379 |
</td>
|
|
|
380 |
<td width="6%"></td>
|
|
|
381 |
<td width="6%"></td>
|
|
|
382 |
<td width="6%"></td>
|
|
|
383 |
<td width="37%">
|
|
|
384 |
</td>
|
|
|
385 |
<tr valign="top" align="left">
|
|
|
386 |
<td width="17%"></td>
|
|
|
387 |
<td width="6%">
|
|
|
388 |
</td>
|
|
|
389 |
<td width="6%">
|
|
|
390 |
|
|
|
391 |
<p>float</p>
|
|
|
392 |
</td>
|
|
|
393 |
<td width="6%"></td>
|
|
|
394 |
<td width="6%">
|
|
|
395 |
|
|
|
396 |
<p>X0, Y0, Z0;</p>
|
|
|
397 |
</td>
|
|
|
398 |
<td width="6%"></td>
|
|
|
399 |
<td width="6%"></td>
|
|
|
400 |
<td width="6%">
|
|
|
401 |
|
|
|
402 |
<p>/* Reference white point */</p>
|
|
|
403 |
</td>
|
|
|
404 |
<td width="37%">
|
|
|
405 |
</td>
|
|
|
406 |
<tr valign="top" align="left">
|
|
|
407 |
<td width="17%"></td>
|
|
|
408 |
<td width="6%"></td>
|
|
|
409 |
<td width="6%">
|
|
|
410 |
|
|
|
411 |
<p>TIFFDisplay display;</p>
|
|
|
412 |
</td>
|
|
|
413 |
<td width="6%"></td>
|
|
|
414 |
<td width="6%"></td>
|
|
|
415 |
<td width="6%"></td>
|
|
|
416 |
<td width="6%"></td>
|
|
|
417 |
<td width="6%"></td>
|
|
|
418 |
<td width="37%">
|
|
|
419 |
</td>
|
|
|
420 |
<tr valign="top" align="left">
|
|
|
421 |
<td width="17%"></td>
|
|
|
422 |
<td width="6%">
|
|
|
423 |
</td>
|
|
|
424 |
<td width="6%">
|
|
|
425 |
|
|
|
426 |
<p>float</p>
|
|
|
427 |
</td>
|
|
|
428 |
<td width="6%"></td>
|
|
|
429 |
<td width="6%">
|
|
|
430 |
|
|
|
431 |
<p>Yr2r[CIELABTORGB_TABLE_RANGE + 1]; /* Conversion of Yr
|
|
|
432 |
to r */</p>
|
|
|
433 |
</td>
|
|
|
434 |
<td width="6%"></td>
|
|
|
435 |
<td width="6%"></td>
|
|
|
436 |
<td width="6%"></td>
|
|
|
437 |
<td width="37%">
|
|
|
438 |
</td>
|
|
|
439 |
<tr valign="top" align="left">
|
|
|
440 |
<td width="17%"></td>
|
|
|
441 |
<td width="6%">
|
|
|
442 |
</td>
|
|
|
443 |
<td width="6%">
|
|
|
444 |
|
|
|
445 |
<p>float</p>
|
|
|
446 |
</td>
|
|
|
447 |
<td width="6%"></td>
|
|
|
448 |
<td width="6%">
|
|
|
449 |
|
|
|
450 |
<p>Yg2g[CIELABTORGB_TABLE_RANGE + 1]; /* Conversion of Yg
|
|
|
451 |
to g */</p>
|
|
|
452 |
</td>
|
|
|
453 |
<td width="6%"></td>
|
|
|
454 |
<td width="6%"></td>
|
|
|
455 |
<td width="6%"></td>
|
|
|
456 |
<td width="37%">
|
|
|
457 |
</td>
|
|
|
458 |
<tr valign="top" align="left">
|
|
|
459 |
<td width="17%"></td>
|
|
|
460 |
<td width="6%">
|
|
|
461 |
</td>
|
|
|
462 |
<td width="6%">
|
|
|
463 |
|
|
|
464 |
<p>float</p>
|
|
|
465 |
</td>
|
|
|
466 |
<td width="6%"></td>
|
|
|
467 |
<td width="6%">
|
|
|
468 |
|
|
|
469 |
<p>Yb2b[CIELABTORGB_TABLE_RANGE + 1]; /* Conversion of Yb
|
|
|
470 |
to b */</p>
|
|
|
471 |
</td>
|
|
|
472 |
<td width="6%"></td>
|
|
|
473 |
<td width="6%"></td>
|
|
|
474 |
<td width="6%"></td>
|
|
|
475 |
<td width="37%">
|
|
|
476 |
</td>
|
|
|
477 |
</table>
|
|
|
478 |
<!-- INDENTATION -->
|
|
|
479 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
480 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
481 |
<tr valign="top" align="left">
|
|
|
482 |
<td width="17%"></td>
|
|
|
483 |
<td width="82%">
|
|
|
484 |
<p>} TIFFCIELabToRGB;</p></td>
|
|
|
485 |
</table>
|
|
|
486 |
<!-- INDENTATION -->
|
|
|
487 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
488 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
489 |
<tr valign="top" align="left">
|
|
|
490 |
<td width="8%"></td>
|
|
|
491 |
<td width="91%">
|
|
|
492 |
<p><i>display</i> is a display device description, declared
|
|
|
493 |
as</p>
|
|
|
494 |
</td>
|
|
|
495 |
</table>
|
|
|
496 |
<!-- INDENTATION -->
|
|
|
497 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
498 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
499 |
<tr valign="top" align="left">
|
|
|
500 |
<td width="17%"></td>
|
|
|
501 |
<td width="82%">
|
|
|
502 |
<pre>typedef struct {
|
|
|
503 |
</pre>
|
|
|
504 |
</td>
|
|
|
505 |
</table>
|
|
|
506 |
<!-- TABS -->
|
|
|
507 |
|
|
|
508 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
509 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
510 |
<tr valign="top" align="left">
|
|
|
511 |
<td width="24%"></td>
|
|
|
512 |
<td width="75%">
|
|
|
513 |
|
|
|
514 |
<p>float d_mat[3][3]; /* XYZ -> luminance matrix */</p>
|
|
|
515 |
</td>
|
|
|
516 |
<tr valign="top" align="left">
|
|
|
517 |
<td width="24%"></td>
|
|
|
518 |
<td width="75%">
|
|
|
519 |
|
|
|
520 |
<p>float d_YCR; /* Light o/p for reference white */</p>
|
|
|
521 |
</td>
|
|
|
522 |
<tr valign="top" align="left">
|
|
|
523 |
<td width="24%"></td>
|
|
|
524 |
<td width="75%">
|
|
|
525 |
|
|
|
526 |
<p>float d_YCG;</p>
|
|
|
527 |
</td>
|
|
|
528 |
<tr valign="top" align="left">
|
|
|
529 |
<td width="24%"></td>
|
|
|
530 |
<td width="75%">
|
|
|
531 |
|
|
|
532 |
<p>float d_YCB;</p>
|
|
|
533 |
</td>
|
|
|
534 |
<tr valign="top" align="left">
|
|
|
535 |
<td width="24%"></td>
|
|
|
536 |
<td width="75%">
|
|
|
537 |
|
|
|
538 |
<p>uint32 d_Vrwr; /* Pixel values for ref. white */</p>
|
|
|
539 |
</td>
|
|
|
540 |
<tr valign="top" align="left">
|
|
|
541 |
<td width="24%"></td>
|
|
|
542 |
<td width="75%">
|
|
|
543 |
|
|
|
544 |
<p>uint32 d_Vrwg;</p>
|
|
|
545 |
</td>
|
|
|
546 |
<tr valign="top" align="left">
|
|
|
547 |
<td width="24%"></td>
|
|
|
548 |
<td width="75%">
|
|
|
549 |
|
|
|
550 |
<p>uint32 d_Vrwb;</p>
|
|
|
551 |
</td>
|
|
|
552 |
<tr valign="top" align="left">
|
|
|
553 |
<td width="24%"></td>
|
|
|
554 |
<td width="75%">
|
|
|
555 |
|
|
|
556 |
<p>float d_Y0R; /* Residual light for black pixel */</p>
|
|
|
557 |
</td>
|
|
|
558 |
<tr valign="top" align="left">
|
|
|
559 |
<td width="24%"></td>
|
|
|
560 |
<td width="75%">
|
|
|
561 |
|
|
|
562 |
<p>float d_Y0G;</p>
|
|
|
563 |
</td>
|
|
|
564 |
<tr valign="top" align="left">
|
|
|
565 |
<td width="24%"></td>
|
|
|
566 |
<td width="75%">
|
|
|
567 |
|
|
|
568 |
<p>float d_Y0B;</p>
|
|
|
569 |
</td>
|
|
|
570 |
<tr valign="top" align="left">
|
|
|
571 |
<td width="24%"></td>
|
|
|
572 |
<td width="75%">
|
|
|
573 |
|
|
|
574 |
<p>float d_gammaR; /* Gamma values for the three guns
|
|
|
575 |
*/</p>
|
|
|
576 |
</td>
|
|
|
577 |
<tr valign="top" align="left">
|
|
|
578 |
<td width="24%"></td>
|
|
|
579 |
<td width="75%">
|
|
|
580 |
|
|
|
581 |
<p>float d_gammaG;</p>
|
|
|
582 |
</td>
|
|
|
583 |
<tr valign="top" align="left">
|
|
|
584 |
<td width="24%"></td>
|
|
|
585 |
<td width="75%">
|
|
|
586 |
|
|
|
587 |
<p>float d_gammaB;</p>
|
|
|
588 |
</td>
|
|
|
589 |
</table>
|
|
|
590 |
<!-- INDENTATION -->
|
|
|
591 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
592 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
593 |
<tr valign="top" align="left">
|
|
|
594 |
<td width="17%"></td>
|
|
|
595 |
<td width="82%">
|
|
|
596 |
<p>} TIFFDisplay;</p></td>
|
|
|
597 |
</table>
|
|
|
598 |
<!-- INDENTATION -->
|
|
|
599 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
600 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
601 |
<tr valign="top" align="left">
|
|
|
602 |
<td width="8%"></td>
|
|
|
603 |
<td width="91%">
|
|
|
604 |
<p>For example, the one can use sRGB device, which has the
|
|
|
605 |
following parameters:</p>
|
|
|
606 |
</td>
|
|
|
607 |
</table>
|
|
|
608 |
<!-- INDENTATION -->
|
|
|
609 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
610 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
611 |
<tr valign="top" align="left">
|
|
|
612 |
<td width="17%"></td>
|
|
|
613 |
<td width="82%">
|
|
|
614 |
<pre>TIFFDisplay display_sRGB = {
|
|
|
615 |
</pre>
|
|
|
616 |
</td>
|
|
|
617 |
</table>
|
|
|
618 |
<!-- TABS -->
|
|
|
619 |
|
|
|
620 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
621 |
cols="5" cellspacing="0" cellpadding="0">
|
|
|
622 |
<tr valign="top" align="left">
|
|
|
623 |
<td width="24%"></td>
|
|
|
624 |
<td width="0%"></td>
|
|
|
625 |
<td width="6%">
|
|
|
626 |
|
|
|
627 |
<p>{ /* XYZ -> luminance matrix */</p>
|
|
|
628 |
</td>
|
|
|
629 |
<td width="6%"></td>
|
|
|
630 |
<td width="62%">
|
|
|
631 |
</td>
|
|
|
632 |
<tr valign="top" align="left">
|
|
|
633 |
<td width="24%"></td>
|
|
|
634 |
<td width="0%"></td>
|
|
|
635 |
<td width="6%">
|
|
|
636 |
</td>
|
|
|
637 |
<td width="6%">
|
|
|
638 |
|
|
|
639 |
<p>{ 3.2410F, -1.5374F, -0.4986F },</p>
|
|
|
640 |
</td>
|
|
|
641 |
<td width="62%">
|
|
|
642 |
</td>
|
|
|
643 |
<tr valign="top" align="left">
|
|
|
644 |
<td width="24%"></td>
|
|
|
645 |
<td width="0%"></td>
|
|
|
646 |
<td width="6%">
|
|
|
647 |
</td>
|
|
|
648 |
<td width="6%">
|
|
|
649 |
|
|
|
650 |
<p>{ -0.9692F, 1.8760F, 0.0416F },</p>
|
|
|
651 |
</td>
|
|
|
652 |
<td width="62%">
|
|
|
653 |
</td>
|
|
|
654 |
<tr valign="top" align="left">
|
|
|
655 |
<td width="24%"></td>
|
|
|
656 |
<td width="0%"></td>
|
|
|
657 |
<td width="6%">
|
|
|
658 |
</td>
|
|
|
659 |
<td width="6%">
|
|
|
660 |
|
|
|
661 |
<p>{ 0.0556F, -0.2040F, 1.0570F }</p>
|
|
|
662 |
</td>
|
|
|
663 |
<td width="62%">
|
|
|
664 |
</td>
|
|
|
665 |
<tr valign="top" align="left">
|
|
|
666 |
<td width="24%"></td>
|
|
|
667 |
<td width="0%"></td>
|
|
|
668 |
<td width="6%">
|
|
|
669 |
|
|
|
670 |
<p>},</p>
|
|
|
671 |
</td>
|
|
|
672 |
<td width="6%">
|
|
|
673 |
</td>
|
|
|
674 |
<td width="62%">
|
|
|
675 |
</td>
|
|
|
676 |
<tr valign="top" align="left">
|
|
|
677 |
<td width="24%"></td>
|
|
|
678 |
<td width="0%"></td>
|
|
|
679 |
<td width="6%">
|
|
|
680 |
|
|
|
681 |
<p>100.0F, 100.0F, 100.0F, /* Light o/p for reference white
|
|
|
682 |
*/</p>
|
|
|
683 |
</td>
|
|
|
684 |
<td width="6%"></td>
|
|
|
685 |
<td width="62%">
|
|
|
686 |
</td>
|
|
|
687 |
<tr valign="top" align="left">
|
|
|
688 |
<td width="24%"></td>
|
|
|
689 |
<td width="0%"></td>
|
|
|
690 |
<td width="6%">
|
|
|
691 |
|
|
|
692 |
<p>255, 255, 255, /* Pixel values for ref. white */</p>
|
|
|
693 |
</td>
|
|
|
694 |
<td width="6%"></td>
|
|
|
695 |
<td width="62%">
|
|
|
696 |
</td>
|
|
|
697 |
<tr valign="top" align="left">
|
|
|
698 |
<td width="24%"></td>
|
|
|
699 |
<td width="0%"></td>
|
|
|
700 |
<td width="6%">
|
|
|
701 |
|
|
|
702 |
<p>1.0F, 1.0F, 1.0F, /* Residual light o/p for black pixel
|
|
|
703 |
*/</p>
|
|
|
704 |
</td>
|
|
|
705 |
<td width="6%"></td>
|
|
|
706 |
<td width="62%">
|
|
|
707 |
</td>
|
|
|
708 |
<tr valign="top" align="left">
|
|
|
709 |
<td width="24%"></td>
|
|
|
710 |
<td width="0%"></td>
|
|
|
711 |
<td width="6%">
|
|
|
712 |
|
|
|
713 |
<p>2.4F, 2.4F, 2.4F, /* Gamma values for the three guns
|
|
|
714 |
*/</p>
|
|
|
715 |
</td>
|
|
|
716 |
<td width="6%"></td>
|
|
|
717 |
<td width="62%">
|
|
|
718 |
</td>
|
|
|
719 |
</table>
|
|
|
720 |
<!-- INDENTATION -->
|
|
|
721 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
722 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
723 |
<tr valign="top" align="left">
|
|
|
724 |
<td width="17%"></td>
|
|
|
725 |
<td width="82%">
|
|
|
726 |
<p>};</p></td>
|
|
|
727 |
</table>
|
|
|
728 |
<!-- INDENTATION -->
|
|
|
729 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
730 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
731 |
<tr valign="top" align="left">
|
|
|
732 |
<td width="8%"></td>
|
|
|
733 |
<td width="91%">
|
|
|
734 |
<p><i>refWhite</i> is a color temperature of the reference
|
|
|
735 |
white. The <i>TIFFTAG_WHITEPOINT</i> contains the
|
|
|
736 |
chromaticity of the white point of the image from where the
|
|
|
737 |
reference white can be calculated using following
|
|
|
738 |
formulae:</p>
|
|
|
739 |
</td>
|
|
|
740 |
</table>
|
|
|
741 |
<!-- INDENTATION -->
|
|
|
742 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
743 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
744 |
<tr valign="top" align="left">
|
|
|
745 |
<td width="17%"></td>
|
|
|
746 |
<td width="82%">
|
|
|
747 |
<p>refWhite_Y = 100.0<br>
|
|
|
748 |
refWhite_X = whitePoint_x / whitePoint_y * refWhite_Y<br>
|
|
|
749 |
refWhite_Z = (1.0 - whitePoint_x - whitePoint_y) /
|
|
|
750 |
whitePoint_y * refWhite_X</p></td>
|
|
|
751 |
</table>
|
|
|
752 |
<!-- INDENTATION -->
|
|
|
753 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
754 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
755 |
<tr valign="top" align="left">
|
|
|
756 |
<td width="8%"></td>
|
|
|
757 |
<td width="91%">
|
|
|
758 |
<p>The conversion itself performed in two steps: at the
|
|
|
759 |
first one we will convert <i>CIE L*a*b* 1976</i> to <i>CIE
|
|
|
760 |
XYZ</i> using <b>TIFFCIELabToXYZ()</b> routine, and at the
|
|
|
761 |
second step we will convert <i>CIE XYZ</i> to <i>RGB</i>
|
|
|
762 |
using <b>TIFFXYZToRGB().</b> Look at the code sample
|
|
|
763 |
below:</p>
|
|
|
764 |
</td>
|
|
|
765 |
</table>
|
|
|
766 |
<!-- INDENTATION -->
|
|
|
767 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
768 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
769 |
<tr valign="top" align="left">
|
|
|
770 |
<td width="17%"></td>
|
|
|
771 |
<td width="82%">
|
|
|
772 |
<pre>float *whitePoint;
|
|
|
773 |
float refWhite[3];
|
|
|
774 |
|
|
|
775 |
/* Initialize structures */
|
|
|
776 |
img->cielab = (TIFFCIELabToRGB *)
|
|
|
777 |
</pre>
|
|
|
778 |
</td>
|
|
|
779 |
</table>
|
|
|
780 |
<!-- TABS -->
|
|
|
781 |
|
|
|
782 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
783 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
784 |
<tr valign="top" align="left">
|
|
|
785 |
<td width="24%"></td>
|
|
|
786 |
<td width="75%">
|
|
|
787 |
|
|
|
788 |
<p>_TIFFmalloc(sizeof(TIFFCIELabToRGB));</p>
|
|
|
789 |
</td>
|
|
|
790 |
</table>
|
|
|
791 |
<!-- INDENTATION -->
|
|
|
792 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
793 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
794 |
<tr valign="top" align="left">
|
|
|
795 |
<td width="17%"></td>
|
|
|
796 |
<td width="82%">
|
|
|
797 |
<p>if (!cielab) {</p></td>
|
|
|
798 |
</table>
|
|
|
799 |
<!-- TABS -->
|
|
|
800 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
801 |
cols="5" cellspacing="0" cellpadding="0">
|
|
|
802 |
<tr valign="top" align="left">
|
|
|
803 |
<td width="24%"></td>
|
|
|
804 |
<td width="0%"></td>
|
|
|
805 |
<td width="6%">
|
|
|
806 |
|
|
|
807 |
<p>TIFFError("CIE L*a*b*->RGB",</p>
|
|
|
808 |
</td>
|
|
|
809 |
<td width="6%"></td>
|
|
|
810 |
<td width="62%">
|
|
|
811 |
</td>
|
|
|
812 |
<tr valign="top" align="left">
|
|
|
813 |
<td width="24%"></td>
|
|
|
814 |
<td width="0%"></td>
|
|
|
815 |
<td width="6%">
|
|
|
816 |
</td>
|
|
|
817 |
<td width="6%">
|
|
|
818 |
|
|
|
819 |
<p>"No space for CIE L*a*b*->RGB conversion
|
|
|
820 |
state.");</p>
|
|
|
821 |
</td>
|
|
|
822 |
<td width="62%">
|
|
|
823 |
</td>
|
|
|
824 |
<tr valign="top" align="left">
|
|
|
825 |
<td width="24%"></td>
|
|
|
826 |
<td width="0%"></td>
|
|
|
827 |
<td width="6%">
|
|
|
828 |
|
|
|
829 |
<p>exit(0);</p>
|
|
|
830 |
</td>
|
|
|
831 |
<td width="6%"></td>
|
|
|
832 |
<td width="62%">
|
|
|
833 |
</td>
|
|
|
834 |
</table>
|
|
|
835 |
<!-- INDENTATION -->
|
|
|
836 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
837 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
838 |
<tr valign="top" align="left">
|
|
|
839 |
<td width="17%"></td>
|
|
|
840 |
<td width="82%">
|
|
|
841 |
<p>}</p>
|
|
|
842 |
<!-- INDENTATION -->
|
|
|
843 |
<p>TIFFGetFieldDefaulted(tif, TIFFTAG_WHITEPOINT,
|
|
|
844 |
&whitePoint);<br>
|
|
|
845 |
refWhite[1] = 100.0F;<br>
|
|
|
846 |
refWhite[0] = whitePoint[0] / whitePoint[1] *
|
|
|
847 |
refWhite[1];<br>
|
|
|
848 |
refWhite[2] = (1.0F - whitePoint[0] -
|
|
|
849 |
whitePoint[1])</p></td>
|
|
|
850 |
</table>
|
|
|
851 |
<!-- TABS -->
|
|
|
852 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
853 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
854 |
<tr valign="top" align="left">
|
|
|
855 |
<td width="24%"></td>
|
|
|
856 |
<td width="75%">
|
|
|
857 |
|
|
|
858 |
<p>/ whitePoint[1] * refWhite[1];</p>
|
|
|
859 |
</td>
|
|
|
860 |
</table>
|
|
|
861 |
<!-- INDENTATION -->
|
|
|
862 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
863 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
864 |
<tr valign="top" align="left">
|
|
|
865 |
<td width="17%"></td>
|
|
|
866 |
<td width="82%">
|
|
|
867 |
<p>if (TIFFCIELabToRGBInit(cielab, &display_sRGB,
|
|
|
868 |
refWhite) < 0) {</p></td>
|
|
|
869 |
</table>
|
|
|
870 |
<!-- TABS -->
|
|
|
871 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
872 |
cols="5" cellspacing="0" cellpadding="0">
|
|
|
873 |
<tr valign="top" align="left">
|
|
|
874 |
<td width="24%"></td>
|
|
|
875 |
<td width="0%"></td>
|
|
|
876 |
<td width="6%">
|
|
|
877 |
|
|
|
878 |
<p>TIFFError("CIE L*a*b*->RGB",</p>
|
|
|
879 |
</td>
|
|
|
880 |
<td width="6%"></td>
|
|
|
881 |
<td width="62%">
|
|
|
882 |
</td>
|
|
|
883 |
<tr valign="top" align="left">
|
|
|
884 |
<td width="24%"></td>
|
|
|
885 |
<td width="0%"></td>
|
|
|
886 |
<td width="6%">
|
|
|
887 |
</td>
|
|
|
888 |
<td width="6%">
|
|
|
889 |
|
|
|
890 |
<p>"Failed to initialize CIE L*a*b*->RGB conversion
|
|
|
891 |
state.");</p>
|
|
|
892 |
</td>
|
|
|
893 |
<td width="62%">
|
|
|
894 |
</td>
|
|
|
895 |
<tr valign="top" align="left">
|
|
|
896 |
<td width="24%"></td>
|
|
|
897 |
<td width="0%"></td>
|
|
|
898 |
<td width="6%">
|
|
|
899 |
|
|
|
900 |
<p>_TIFFfree(cielab);</p>
|
|
|
901 |
</td>
|
|
|
902 |
<td width="6%"></td>
|
|
|
903 |
<td width="62%">
|
|
|
904 |
</td>
|
|
|
905 |
<tr valign="top" align="left">
|
|
|
906 |
<td width="24%"></td>
|
|
|
907 |
<td width="0%"></td>
|
|
|
908 |
<td width="6%">
|
|
|
909 |
|
|
|
910 |
<p>exit(0);</p>
|
|
|
911 |
</td>
|
|
|
912 |
<td width="6%"></td>
|
|
|
913 |
<td width="62%">
|
|
|
914 |
</td>
|
|
|
915 |
</table>
|
|
|
916 |
<!-- INDENTATION -->
|
|
|
917 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
918 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
919 |
<tr valign="top" align="left">
|
|
|
920 |
<td width="17%"></td>
|
|
|
921 |
<td width="82%">
|
|
|
922 |
<p>}</p>
|
|
|
923 |
<!-- INDENTATION -->
|
|
|
924 |
<p>/* Now we can start to convert */<br>
|
|
|
925 |
uint32 r, g, b;<br>
|
|
|
926 |
uint32 L;<br>
|
|
|
927 |
int32 a, b;<br>
|
|
|
928 |
float X, Y, Z;</p>
|
|
|
929 |
<!-- INDENTATION -->
|
|
|
930 |
<p>for each pixel in image</p></td>
|
|
|
931 |
</table>
|
|
|
932 |
<!-- TABS -->
|
|
|
933 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
934 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
935 |
<tr valign="top" align="left">
|
|
|
936 |
<td width="24%"></td>
|
|
|
937 |
<td width="75%">
|
|
|
938 |
|
|
|
939 |
<p>TIFFCIELabToXYZ(cielab, L, a, b, &X, &Y,
|
|
|
940 |
&Z);</p>
|
|
|
941 |
</td>
|
|
|
942 |
<tr valign="top" align="left">
|
|
|
943 |
<td width="24%"></td>
|
|
|
944 |
<td width="75%">
|
|
|
945 |
|
|
|
946 |
<p>TIFFXYZToRGB(cielab, X, Y, Z, &r, &g,
|
|
|
947 |
&b);</p>
|
|
|
948 |
</td>
|
|
|
949 |
</table>
|
|
|
950 |
<!-- INDENTATION -->
|
|
|
951 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
952 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
953 |
<tr valign="top" align="left">
|
|
|
954 |
<td width="17%"></td>
|
|
|
955 |
<td width="82%">
|
|
|
956 |
<p>/* Don’t forget to free the state structure */<br>
|
|
|
957 |
_TIFFfree(cielab);</p></td>
|
|
|
958 |
</table>
|
|
|
959 |
<a name="SEE ALSO"></a>
|
|
|
960 |
<h2>SEE ALSO</h2>
|
|
|
961 |
<!-- INDENTATION -->
|
|
|
962 |
<table width="100%" border=0 rules="none" frame="void"
|
|
|
963 |
cols="2" cellspacing="0" cellpadding="0">
|
|
|
964 |
<tr valign="top" align="left">
|
|
|
965 |
<td width="8%"></td>
|
|
|
966 |
<td width="91%">
|
|
|
967 |
<p><b>TIFFRGBAImage</b>(3TIFF) <b>libtiff</b>(3TIFF),</p>
|
|
|
968 |
<!-- INDENTATION -->
|
|
|
969 |
<p>Libtiff library home page:
|
|
|
970 |
<b>http://www.remotesensing.org/libtiff/</b></p>
|
|
|
971 |
</td>
|
|
|
972 |
</table>
|
|
|
973 |
<hr>
|
|
|
974 |
</body>
|
|
|
975 |
</html>
|