2006-01-02 18:50:44 -05:00
|
|
|
<!-- Creator : groff version 1.19.2 -->
|
|
|
|
<!-- CreationDate: Mon Jan 2 17:41:35 2006 -->
|
|
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
|
|
|
|
"http://www.w3.org/TR/html4/loose.dtd">
|
2005-03-06 06:11:43 -05:00
|
|
|
<html>
|
|
|
|
<head>
|
|
|
|
<meta name="generator" content="groff -Thtml, see www.gnu.org">
|
2006-01-02 18:50:44 -05:00
|
|
|
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
|
2005-03-06 06:11:43 -05:00
|
|
|
<meta name="Content-Style" content="text/css">
|
2006-01-02 18:50:44 -05:00
|
|
|
<style type="text/css">
|
|
|
|
p { margin-top: 0; margin-bottom: 0; }
|
|
|
|
pre { margin-top: 0; margin-bottom: 0; }
|
|
|
|
table { margin-top: 0; margin-bottom: 0; }
|
|
|
|
</style>
|
2005-03-06 06:11:43 -05:00
|
|
|
<title>COLOR</title>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
</head>
|
|
|
|
<body>
|
|
|
|
|
|
|
|
<h1 align=center>COLOR</h1>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a href="#NAME">NAME</a><br>
|
|
|
|
<a href="#SYNOPSIS">SYNOPSIS</a><br>
|
|
|
|
<a href="#DESCRIPTION">DESCRIPTION</a><br>
|
|
|
|
<a href="#SEE ALSO">SEE ALSO</a><br>
|
|
|
|
|
|
|
|
<hr>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="NAME"></a>
|
|
|
|
<h2>NAME</h2>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">TIFFYCbCrToRGBInit,
|
|
|
|
TIFFYCbCrtoRGB, TIFFCIELabToRGBInit, TIFFCIELabToXYZ,
|
|
|
|
TIFFXYZToRGB − color conversion routines.</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="SYNOPSIS"></a>
|
|
|
|
<h2>SYNOPSIS</h2>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>#include
|
|
|
|
<tiffio.h></b></p>
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>int
|
|
|
|
TIFFYCbCrToRGBInit(TIFFYCbCrToRGB *</b><i>ycbcr</i><b>,
|
|
|
|
float *</b><i>luma</i><b>, float
|
|
|
|
*</b><i>refBlackWhite"</i><b>);" <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
void TIFFYCbCrtoRGB(TIFFYCbCrToRGB *</b><i>ycbcr</i><b>,
|
|
|
|
uint32</b> <i>Y</i><b>, int32</b> <i>Cb</i><b>, int32</b>
|
|
|
|
<i>Cr</i><b>, uint32 *</b><i>R</i><b>, uint32
|
|
|
|
*</b><i>G</i><b>, uint32 *</b><i>B</i> <b>);</b></p>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>int
|
|
|
|
TIFFCIELabToRGBInit(TIFFCIELabToRGB *</b><i>cielab</i><b>,
|
|
|
|
TIFFDisplay *</b><i>display</i><b>, float
|
|
|
|
*</b><i>refWhite</i><b>); <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
void TIFFCIELabToXYZ(TIFFCIELabToRGB *</b><i>cielab</i><b>,
|
|
|
|
uint32</b> <i>L</i><b>, int32</b> <i>a</i><b>, int32</b>
|
|
|
|
<i>b</i><b>, float *</b><i>X</i><b>, float *</b><i>Y</i><b>,
|
2006-01-02 18:50:44 -05:00
|
|
|
float *</b><i>Z</i><b>); <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
void TIFFXYZToRGB(TIFFCIELabToRGB *</b><i>cielab</i><b>,
|
|
|
|
float</b> <i>X</i><b>, float</b> <i>Y</i><b>, float</b>
|
|
|
|
<i>Z"</i><b>,</b><i>uint32</i><b>*"</b><i>R</i><b>,
|
|
|
|
uint32 *</b><i>G</i><b>, uint32 *</b><i>B</i><b>);</b></p>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="DESCRIPTION"></a>
|
|
|
|
<h2>DESCRIPTION</h2>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">TIFF supports
|
|
|
|
several color spaces for images stored in that format. There
|
|
|
|
is usually a problem of application to handle the data
|
|
|
|
properly and convert between different colorspaces for
|
|
|
|
displaying and printing purposes. To simplify this task
|
|
|
|
libtiff implements several color conversion routines itself.
|
|
|
|
In particular, these routines used in
|
|
|
|
<b>TIFFRGBAImage(3TIFF)</b> interface.</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>TIFFYCbCrToRGBInit()</b>
|
|
|
|
used to initialize <i>YCbCr</i> to <i>RGB</i> conversion
|
|
|
|
state. Allocating and freeing of the <i>ycbcr</i> structure
|
|
|
|
belongs to programmer. <i>TIFFYCbCrToRGB</i> defined in
|
|
|
|
<b>tiffio.h</b> as</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">typedef struct
|
|
|
|
{ /* YCbCr->RGB support */ <br>
|
|
|
|
TIFFRGBValue* clamptab; /* range clamping table */</p>
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">int*</p><td width="34%"></td>
|
|
|
|
<td width="-26%"></td>
|
|
|
|
<td width="15%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="69%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">Cr_r_tab; <br>
|
|
|
|
int*</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="34%"></td>
|
|
|
|
<td width="-26%"></td>
|
|
|
|
<td width="15%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="69%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">Cb_b_tab; <br>
|
|
|
|
int32*</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="34%"></td>
|
|
|
|
<td width="-26%"></td>
|
|
|
|
<td width="15%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="69%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">Cr_g_tab; <br>
|
|
|
|
int32*</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="34%"></td>
|
|
|
|
<td width="-26%"></td>
|
|
|
|
<td width="15%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="69%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">Cb_g_tab;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">int32* Y_tab; <br>
|
|
|
|
} TIFFYCbCrToRGB;</p>
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><i>luma</i> is
|
|
|
|
a float array of three values representing proportions of
|
|
|
|
the red, green and blue in luminance, Y (see section 21 of
|
|
|
|
the TIFF 6.0 specification, where the YCbCr images
|
|
|
|
discussed). <i>TIFFTAG_YCBCRCOEFFICIENTS</i> holds that
|
|
|
|
values in TIFF file. <i>refBlackWhite</i> is a float array
|
|
|
|
of 6 values which specifies a pair of headroom and footroom
|
|
|
|
image data values (codes) for each image component (see
|
|
|
|
section 20 of the TIFF 6.0 specification where the
|
2005-03-06 06:11:43 -05:00
|
|
|
colorinmetry fields discussed).
|
|
|
|
<i>TIFFTAG_REFERENCEBLACKWHITE</i> is responsible for
|
|
|
|
storing these values in TIFF file. Following code snippet
|
|
|
|
should helps to understand the the technique:</p>
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p style="margin-left:22%; margin-top: 1em">float *luma,
|
|
|
|
*refBlackWhite; <br>
|
|
|
|
uint16 hs, vs;</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">/* Initialize
|
|
|
|
structures */ <br>
|
|
|
|
ycbcr = (TIFFYCbCrToRGB*)</p>
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">_TIFFmalloc(TIFFroundup(sizeof(TIFFYCbCrToRGB),
|
|
|
|
sizeof(long))</p> </td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">+ 4*256*sizeof(TIFFRGBValue)</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">+ 2*256*sizeof(int)</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">+ 3*256*sizeof(int32));</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">if (ycbcr == NULL) { <br>
|
|
|
|
TIFFError("YCbCr->RGB",</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">"No space for YCbCr->RGB conversion
|
|
|
|
state");</p> </td>
|
|
|
|
</table>
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">exit(0); <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
}</p>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">TIFFGetFieldDefaulted(tif,
|
|
|
|
TIFFTAG_YCBCRCOEFFICIENTS, &luma); <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
TIFFGetFieldDefaulted(tif, TIFFTAG_REFERENCEBLACKWHITE,
|
2006-01-02 18:50:44 -05:00
|
|
|
&refBlackWhite); <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
if (TIFFYCbCrToRGBInit(ycbcr, luma, refBlackWhite) <
|
2006-01-02 18:50:44 -05:00
|
|
|
0)</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">exit(0);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">/* Start
|
|
|
|
conversion */ <br>
|
|
|
|
uint32 r, g, b; <br>
|
|
|
|
uint32 Y; <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
int32 Cb, Cr;</p>
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p style="margin-left:22%; margin-top: 1em">for each pixel
|
|
|
|
in image</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">TIFFYCbCrtoRGB(img->ycbcr, Y, Cb, Cr,
|
|
|
|
&r, &g, &b);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">/* Free state
|
|
|
|
structure */ <br>
|
|
|
|
_TIFFfree(ycbcr);</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>TIFFCIELabToRGBInit()</b>
|
|
|
|
initializes the <i>CIE L*a*b* 1976</i> to <i>RGB</i>
|
|
|
|
conversion state. <b>TIFFCIELabToRGB</b> defined as</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">#define
|
|
|
|
CIELABTORGB_TABLE_RANGE 1500</p>
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">typedef struct {</p></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="46%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">/* CIE Lab 1976->RGB support */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">int</p></td>
|
|
|
|
<td width="7%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">range;</p></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="46%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">/* Size of conversion table */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">float</p></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">rstep, gstep, bstep;</p></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="46%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">float</p></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">X0, Y0, Z0;</p></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="46%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">/* Reference white point */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">TIFFDisplay display;</p></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="46%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">float</p></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">Yr2r[CIELABTORGB_TABLE_RANGE + 1]; /*
|
|
|
|
Conversion of Yr to r */</p></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="46%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">float</p></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">Yg2g[CIELABTORGB_TABLE_RANGE + 1]; /*
|
|
|
|
Conversion of Yg to g */</p></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="46%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="22%"></td>
|
|
|
|
<td width="-14%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">float</p></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">Yb2b[CIELABTORGB_TABLE_RANGE + 1]; /*
|
|
|
|
Conversion of Yb to b */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<td width="8%"></td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="46%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">} TIFFCIELabToRGB;</p>
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><i>display</i>
|
|
|
|
is a display device description, declared as</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">typedef struct
|
|
|
|
{</p>
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_mat[3][3]; /* XYZ -> luminance
|
|
|
|
matrix */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_YCR; /* Light o/p for reference
|
|
|
|
white */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_YCG;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_YCB;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">uint32 d_Vrwr; /* Pixel values for ref.
|
|
|
|
white */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">uint32 d_Vrwg;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">uint32 d_Vrwb;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_Y0R; /* Residual light for black
|
|
|
|
pixel */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_Y0G;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_Y0B;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_gammaR; /* Gamma values for the
|
|
|
|
three guns */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_gammaG;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">float d_gammaB;</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">} TIFFDisplay;</p>
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">For example,
|
|
|
|
the one can use sRGB device, which has the following
|
|
|
|
parameters:</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">TIFFDisplay
|
|
|
|
display_sRGB = {</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">{ /* XYZ -> luminance matrix */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">{ 3.2410F, -1.5374F, -0.4986F },</p></td>
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">{ -0.9692F, 1.8760F, 0.0416F },</p></td>
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">{ 0.0556F, -0.2040F, 1.0570F }</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">},</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">100.0F, 100.0F, 100.0F, /* Light o/p for
|
|
|
|
reference white */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">255, 255, 255, /* Pixel values for ref.
|
|
|
|
white */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">1.0F, 1.0F, 1.0F, /* Residual light o/p for
|
|
|
|
black pixel */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">2.4F, 2.4F, 2.4F, /* Gamma values for the
|
|
|
|
three guns */</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">};</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><i>refWhite</i>
|
|
|
|
is a color temperature of the reference white. The
|
|
|
|
<i>TIFFTAG_WHITEPOINT</i> contains the chromaticity of the
|
|
|
|
white point of the image from where the reference white can
|
|
|
|
be calculated using following formulae:</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">refWhite_Y =
|
|
|
|
100.0 <br>
|
|
|
|
refWhite_X = whitePoint_x / whitePoint_y * refWhite_Y <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
refWhite_Z = (1.0 - whitePoint_x - whitePoint_y) /
|
2006-01-02 18:50:44 -05:00
|
|
|
whitePoint_y * refWhite_X</p>
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">The conversion
|
|
|
|
itself performed in two steps: at the first one we will
|
|
|
|
convert <i>CIE L*a*b* 1976</i> to <i>CIE XYZ</i> using
|
|
|
|
<b>TIFFCIELabToXYZ()</b> routine, and at the second step we
|
|
|
|
will convert <i>CIE XYZ</i> to <i>RGB</i> using
|
|
|
|
<b>TIFFXYZToRGB().</b> Look at the code sample below:</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">float
|
|
|
|
*whitePoint; <br>
|
|
|
|
float refWhite[3];</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">/* Initialize
|
|
|
|
structures */ <br>
|
|
|
|
img->cielab = (TIFFCIELabToRGB *)</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">_TIFFmalloc(sizeof(TIFFCIELabToRGB));</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p style="margin-left:22%;">if (!cielab) {</p>
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">TIFFError("CIE
|
|
|
|
L*a*b*->RGB",</p> </td>
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">"No space for CIE L*a*b*->RGB
|
|
|
|
conversion state.");</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">exit(0);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">}</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">TIFFGetFieldDefaulted(tif,
|
|
|
|
TIFFTAG_WHITEPOINT, &whitePoint); <br>
|
|
|
|
refWhite[1] = 100.0F; <br>
|
|
|
|
refWhite[0] = whitePoint[0] / whitePoint[1] * refWhite[1];
|
|
|
|
<br>
|
|
|
|
refWhite[2] = (1.0F - whitePoint[0] - whitePoint[1])</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">/ whitePoint[1] * refWhite[1];</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">if (TIFFCIELabToRGBInit(cielab,
|
|
|
|
&display_sRGB, refWhite) < 0) {</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">TIFFError("CIE
|
|
|
|
L*a*b*->RGB",</p> </td>
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
</td>
|
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">"Failed to initialize CIE
|
|
|
|
L*a*b*->RGB conversion state.");</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">_TIFFfree(cielab);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="7%"></td>
|
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="77%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p valign="top">exit(0);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%;">}</p>
|
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">/* Now we can
|
|
|
|
start to convert */ <br>
|
|
|
|
uint32 r, g, b; <br>
|
|
|
|
uint32 L; <br>
|
|
|
|
int32 a, b; <br>
|
2005-03-06 06:11:43 -05:00
|
|
|
float X, Y, Z;</p>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">for each pixel
|
|
|
|
in image</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<table width="100%" border=0 rules="none" frame="void"
|
2006-01-02 18:50:44 -05:00
|
|
|
cellspacing="0" cellpadding="0">
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
2005-03-06 06:11:43 -05:00
|
|
|
|
|
|
|
|
2006-01-02 18:50:44 -05:00
|
|
|
<p valign="top">TIFFCIELabToXYZ(cielab, L, a, b, &X,
|
|
|
|
&Y, &Z);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
<tr valign="top" align="left">
|
2006-01-02 18:50:44 -05:00
|
|
|
<td width="8%"></td>
|
|
|
|
<td width="92%">
|
|
|
|
|
|
|
|
|
|
|
|
<p valign="top">TIFFXYZToRGB(cielab, X, Y, Z, &r,
|
|
|
|
&g, &b);</p></td>
|
2005-03-06 06:11:43 -05:00
|
|
|
</table>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
<p style="margin-left:22%; margin-top: 1em">/* Don’t
|
|
|
|
forget to free the state structure */ <br>
|
|
|
|
_TIFFfree(cielab);</p>
|
|
|
|
|
2005-03-06 06:11:43 -05:00
|
|
|
<a name="SEE ALSO"></a>
|
|
|
|
<h2>SEE ALSO</h2>
|
2006-01-02 18:50:44 -05:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>TIFFRGBAImage</b>(3TIFF)
|
|
|
|
<b>libtiff</b>(3TIFF),</p>
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">Libtiff library
|
|
|
|
home page: <b>http://www.remotesensing.org/libtiff/</b></p>
|
2005-03-06 06:11:43 -05:00
|
|
|
<hr>
|
|
|
|
</body>
|
|
|
|
</html>
|