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bw / opentoonz

Blame thirdparty/tiff-4.0.3/html/man/TIFFcolor.3tiff.html

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roentgen	b75cab	`<html>`
roentgen	b75cab	`<head>`
roentgen	b75cab	`<meta name="generator" content="groff -Thtml, see www.gnu.org">`
roentgen	b75cab	`<meta name="Content-Style" content="text/css">`
roentgen	b75cab	`<title>COLOR</title>`
roentgen	b75cab	`</head>`
roentgen	b75cab	`<body>`
roentgen	b75cab
roentgen	b75cab	`COLOR`
roentgen	b75cab	`NAME`
roentgen	b75cab	`SYNOPSIS`
roentgen	b75cab	`DESCRIPTION`
roentgen	b75cab	`SEE ALSO`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`NAME`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab	`TIFFYCbCrToRGBInit, TIFFYCbCrtoRGB, TIFFCIELabToRGBInit,`
roentgen	b75cab	`TIFFCIELabToXYZ, TIFFXYZToRGB − color conversion`
roentgen	b75cab	`routines.`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`SYNOPSIS`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`#include <tiffio.h>`
roentgen	b75cab
roentgen	b75cab	`int TIFFYCbCrToRGBInit(TIFFYCbCrToRGB`
roentgen	b75cab	`ycbcr, float luma, float`
roentgen	b75cab	`*refBlackWhite");"`
roentgen	b75cab	`void TIFFYCbCrtoRGB(TIFFYCbCrToRGB *ycbcr,`
roentgen	b75cab	`uint32 Y, int32 Cb, int32`
roentgen	b75cab	`Cr, uint32 *R, uint32`
roentgen	b75cab	`G, uint32 B );`
roentgen	b75cab
roentgen	b75cab	`int TIFFCIELabToRGBInit(TIFFCIELabToRGB`
roentgen	b75cab	`cielab, TIFFDisplay display,`
roentgen	b75cab	`float *refWhite);`
roentgen	b75cab	`void TIFFCIELabToXYZ(TIFFCIELabToRGB *cielab,`
roentgen	b75cab	`uint32 L, int32 a, int32`
roentgen	b75cab	`b, float X, float Y,`
roentgen	b75cab	`float *Z);`
roentgen	b75cab	`void TIFFXYZToRGB(TIFFCIELabToRGB *cielab,`
roentgen	b75cab	`float X, float Y, float`
roentgen	b75cab	`Z",uint32*"R,`
roentgen	b75cab	`uint32 G, uint32 B);`
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roentgen	b75cab	`DESCRIPTION`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab	`TIFF supports several color spaces for images stored in`
roentgen	b75cab	`that format. There is usually a problem of application to`
roentgen	b75cab	`handle the data properly and convert between different`
roentgen	b75cab	`colorspaces for displaying and printing purposes. To`
roentgen	b75cab	`simplify this task libtiff implements several color`
roentgen	b75cab	`conversion routines itself. In particular, these routines`
roentgen	b75cab	`used in TIFFRGBAImage(3TIFF) interface.`
roentgen	b75cab
roentgen	b75cab	`TIFFYCbCrToRGBInit() used to initialize`
roentgen	b75cab	`YCbCr to RGB conversion state. Allocating and`
roentgen	b75cab	`freeing of the ycbcr structure belongs to programmer.`
roentgen	b75cab	`TIFFYCbCrToRGB defined in tiffio.h as`
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`typedef struct { /* YCbCr->RGB support */`
roentgen	b75cab	`TIFFRGBValue* clamptab; /* range clamping table */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab	`cols="5" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`int*`
roentgen	b75cab
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roentgen	b75cab	`Cr_r_tab;`
roentgen	b75cab	`int*`
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab	`Cb_b_tab;`
roentgen	b75cab	`int32*`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab	`Cr_g_tab;`
roentgen	b75cab	`int32*`
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`Cb_g_tab;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`int32* Y_tab;`
roentgen	b75cab	`} TIFFYCbCrToRGB;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`luma is a float array of three values representing`
roentgen	b75cab	`proportions of the red, green and blue in luminance, Y (see`
roentgen	b75cab	`section 21 of the TIFF 6.0 specification, where the YCbCr`
roentgen	b75cab	`images discussed). TIFFTAG_YCBCRCOEFFICIENTS holds`
roentgen	b75cab	`that values in TIFF file. refBlackWhite is a float`
roentgen	b75cab	`array of 6 values which specifies a pair of headroom and`
roentgen	b75cab	`footroom image data values (codes) for each image component`
roentgen	b75cab	`(see section 20 of the TIFF 6.0 specification where the`
roentgen	b75cab	`colorinmetry fields discussed).`
roentgen	b75cab	`TIFFTAG_REFERENCEBLACKWHITE is responsible for`
roentgen	b75cab	`storing these values in TIFF file. Following code snippet`
roentgen	b75cab	`should helps to understand the the technique:`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float luma, refBlackWhite;`
roentgen	b75cab	`uint16 hs, vs;`
roentgen	b75cab
roentgen	b75cab	`/* Initialize structures */`
roentgen	b75cab	`ycbcr = (TIFFYCbCrToRGB*)`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`_TIFFmalloc(TIFFroundup(sizeof(TIFFYCbCrToRGB),`
roentgen	b75cab	`sizeof(long))`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`+ 4256sizeof(TIFFRGBValue)`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`+ 2256sizeof(int)`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`+ 3256sizeof(int32));`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`if (ycbcr == NULL) {`
roentgen	b75cab	`TIFFError("YCbCr->RGB",`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="4" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab	`"No space for YCbCr->RGB conversion`
roentgen	b75cab	`state");`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`exit(0);`
roentgen	b75cab	`}`
roentgen	b75cab
roentgen	b75cab	`TIFFGetFieldDefaulted(tif, TIFFTAG_YCBCRCOEFFICIENTS,`
roentgen	b75cab	`&luma);`
roentgen	b75cab	`TIFFGetFieldDefaulted(tif, TIFFTAG_REFERENCEBLACKWHITE,`
roentgen	b75cab	`&refBlackWhite);`
roentgen	b75cab	`if (TIFFYCbCrToRGBInit(ycbcr, luma, refBlackWhite) <`
roentgen	b75cab	`0)`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`exit(0);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`/* Start conversion */`
roentgen	b75cab	`uint32 r, g, b;`
roentgen	b75cab	`uint32 Y;`
roentgen	b75cab	`int32 Cb, Cr;`
roentgen	b75cab
roentgen	b75cab	`for each pixel in image`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFYCbCrtoRGB(img->ycbcr, Y, Cb, Cr, &r, &g,`
roentgen	b75cab	`&b);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`/* Free state structure */`
roentgen	b75cab	`_TIFFfree(ycbcr);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFCIELabToRGBInit() initializes the CIE`
roentgen	b75cab	`Lab* 1976 to RGB conversion state.`
roentgen	b75cab	`TIFFCIELabToRGB defined as`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`#define CIELABTORGB_TABLE_RANGE 1500`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="9" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`typedef struct {`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`/* CIE Lab 1976->RGB support */`
roentgen	b75cab
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roentgen	b75cab	`int`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`range;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`/* Size of conversion table */`
roentgen	b75cab
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roentgen	b75cab
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roentgen	b75cab	`float`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`rstep, gstep, bstep;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`float`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`X0, Y0, Z0;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`/* Reference white point */`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`TIFFDisplay display;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`float`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`Yr2r[CIELABTORGB_TABLE_RANGE + 1]; /* Conversion of Yr`
roentgen	b75cab	`to r */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`Yg2g[CIELABTORGB_TABLE_RANGE + 1]; /* Conversion of Yg`
roentgen	b75cab	`to g */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`float`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`Yb2b[CIELABTORGB_TABLE_RANGE + 1]; /* Conversion of Yb`
roentgen	b75cab	`to b */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`} TIFFCIELabToRGB;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`display is a display device description, declared`
roentgen	b75cab	`as`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`typedef struct {`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`float d_mat[3][3]; /* XYZ -> luminance matrix */`
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`float d_YCR; /* Light o/p for reference white */`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_YCG;`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_YCB;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`uint32 d_Vrwr; /* Pixel values for ref. white */`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`uint32 d_Vrwg;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`uint32 d_Vrwb;`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_Y0R; /* Residual light for black pixel */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_Y0G;`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_Y0B;`
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roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab	`float d_gammaR; /* Gamma values for the three guns`
roentgen	b75cab	`*/`
roentgen	b75cab
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_gammaG;`
roentgen	b75cab
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float d_gammaB;`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`} TIFFDisplay;`
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roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`For example, the one can use sRGB device, which has the`
roentgen	b75cab	`following parameters:`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFDisplay display_sRGB = {`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="5" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`{ /* XYZ -> luminance matrix */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`{ 3.2410F, -1.5374F, -0.4986F },`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`{ -0.9692F, 1.8760F, 0.0416F },`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`{ 0.0556F, -0.2040F, 1.0570F }`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`},`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`100.0F, 100.0F, 100.0F, /* Light o/p for reference white`
roentgen	b75cab	`*/`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`255, 255, 255, /* Pixel values for ref. white */`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`1.0F, 1.0F, 1.0F, /* Residual light o/p for black pixel`
roentgen	b75cab	`*/`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`2.4F, 2.4F, 2.4F, /* Gamma values for the three guns`
roentgen	b75cab	`*/`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`};`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`refWhite is a color temperature of the reference`
roentgen	b75cab	`white. The TIFFTAG_WHITEPOINT contains the`
roentgen	b75cab	`chromaticity of the white point of the image from where the`
roentgen	b75cab	`reference white can be calculated using following`
roentgen	b75cab	`formulae:`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`refWhite_Y = 100.0`
roentgen	b75cab	`refWhite_X = whitePoint_x / whitePoint_y * refWhite_Y`
roentgen	b75cab	`refWhite_Z = (1.0 - whitePoint_x - whitePoint_y) /`
roentgen	b75cab	`whitePoint_y * refWhite_X`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`The conversion itself performed in two steps: at the`
roentgen	b75cab	`first one we will convert CIE Lab* 1976 to CIE`
roentgen	b75cab	`XYZ using TIFFCIELabToXYZ() routine, and at the`
roentgen	b75cab	`second step we will convert CIE XYZ to RGB`
roentgen	b75cab	`using TIFFXYZToRGB(). Look at the code sample`
roentgen	b75cab	`below:`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`float *whitePoint;`
roentgen	b75cab	`float refWhite[3];`
roentgen	b75cab
roentgen	b75cab	`/* Initialize structures */`
roentgen	b75cab	`img->cielab = (TIFFCIELabToRGB *)`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`_TIFFmalloc(sizeof(TIFFCIELabToRGB));`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`if (!cielab) {`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="5" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFError("CIE Lab*->RGB",`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`"No space for CIE Lab*->RGB conversion`
roentgen	b75cab	`state.");`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`exit(0);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`}`
roentgen	b75cab
roentgen	b75cab	`TIFFGetFieldDefaulted(tif, TIFFTAG_WHITEPOINT,`
roentgen	b75cab	`&whitePoint);`
roentgen	b75cab	`refWhite[1] = 100.0F;`
roentgen	b75cab	`refWhite[0] = whitePoint[0] / whitePoint[1] *`
roentgen	b75cab	`refWhite[1];`
roentgen	b75cab	`refWhite[2] = (1.0F - whitePoint[0] -`
roentgen	b75cab	`whitePoint[1])`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`/ whitePoint[1] * refWhite[1];`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`if (TIFFCIELabToRGBInit(cielab, &display_sRGB,`
roentgen	b75cab	`refWhite) < 0) {`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="5" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFError("CIE Lab*->RGB",`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`"Failed to initialize CIE Lab*->RGB conversion`
roentgen	b75cab	`state.");`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`_TIFFfree(cielab);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`exit(0);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`}`
roentgen	b75cab
roentgen	b75cab	`/* Now we can start to convert */`
roentgen	b75cab	`uint32 r, g, b;`
roentgen	b75cab	`uint32 L;`
roentgen	b75cab	`int32 a, b;`
roentgen	b75cab	`float X, Y, Z;`
roentgen	b75cab
roentgen	b75cab	`for each pixel in image`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFCIELabToXYZ(cielab, L, a, b, &X, &Y,`
roentgen	b75cab	`&Z);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFXYZToRGB(cielab, X, Y, Z, &r, &g,`
roentgen	b75cab	`&b);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`/* Don’t forget to free the state structure */`
roentgen	b75cab	`_TIFFfree(cielab);`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`SEE ALSO`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`cols="2" cellspacing="0" cellpadding="0">`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`TIFFRGBAImage(3TIFF) libtiff(3TIFF),`
roentgen	b75cab
roentgen	b75cab	`Libtiff library home page:`
roentgen	b75cab	`http://www.remotesensing.org/libtiff/`
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab
roentgen	b75cab	`</body>`
roentgen	b75cab	`</html>`

bw / opentoonz

Source Code

Blame thirdparty/tiff-4.0.3/html/man/TIFFcolor.3tiff.html

COLOR

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO