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CIELab.H
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CIELab.H
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/*
* Copyright (c) 2006-2011, Guillaume Gimenez <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of G.Gimenez nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL G.Gimenez SA BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors:
* * Guillaume Gimenez <[email protected]>
*
*/
/*
//convertion rgv <-> lch depuis ufraw et dcraw
static const double xyz_rgb[3][3] = { //XYZ from RGB
{ 0.412453, 0.357580, 0.180423 },
{ 0.212671, 0.715160, 0.072169 },
{ 0.019334, 0.119193, 0.950227 } };
static const double rgb_xyz[3][3] = { //RGB from XYZ
{ 3.24048, -1.53715, -0.498536 },
{ -0.969255, 1.87599, 0.0415559 },
{ 0.0556466, -0.204041, 1.05731 } };
*/
//sRGB D65 http://www.brucelindbloom.com/
static const double xyz_rgb[3][3] = { //XYZ from RGB
{ 0.4124564, 0.3575761, 0.1804375 },
{ 0.2126729, 0.7151522, 0.0721750 },
{ 0.0193339, 0.1191920, 0.9503041 } };
static const double rgb_xyz[3][3] = { //RGB from XYZ
{ 3.2404542, -1.5371385, -0.4985314 },
{ -0.9692660, 1.8760108, 0.0415560 },
{ 0.0556434, -0.2040259, 1.0572252 } };
/*
//sRGB D50 http://www.brucelindbloom.com/
static const double xyz_rgb[3][3] = {
{ 0.4360747, 0.3850649, 0.1430804 },
{ 0.2225045, 0.7168786, 0.0606169 },
{ 0.0139322, 0.0971045, 0.7141733 } };
static const double rgb_xyz[3][3] = {
{ 3.1338561, -1.6168667, -0.4906146 },
{ -0.9787684, 1.9161415, 0.0334540 },
{ 0.0719453, -0.2289914, 1.4052427 } };
*/
// Illuminant D50
//static const double illuminant[3] = { 0.96422, 1.00000, 0.82521 };
// Illuminent D65
static const double illuminant[3] = { 0.95047, 1.00000, 1.08883 };
/*
static void RGB_to_CIELab(int rgb[3], double lab[3])
{
const double epsilon = 216./24389.,
kappa = 24389./27.;
//RGB -> XYZ
double xyz[3] = { 0., 0., 0. };
for (int c=0; c<3; c++)
for (int cc=0; cc<3; cc++)
xyz[cc] += xyz_rgb[cc][c] * (double(rgb[c])/65535.);
//XYZ -> CIELab
double xr = xyz[0]/illuminant[0];
double yr = xyz[1]/illuminant[1];
double zr = xyz[2]/illuminant[2];
double fx = xr > epsilon ? pow(xr,1./3.) : ( kappa * xr + 16. ) / 116.;
double fy = yr > epsilon ? pow(yr,1./3.) : ( kappa * yr + 16. ) / 116.;
double fz = zr > epsilon ? pow(zr,1./3.) : ( kappa * zr + 16. ) / 116.;
lab[0] = 116. * fy - 16.;
lab[1] = 500. * (fx - fy);
lab[2] = 200. * (fy - fz);
}
static void CIELab_to_RGB(double lab[3], int rgb[3])
{
int c, cc;
double xyz[3], fx, fy, fz, xr, yr, zr, tmpf;
const double epsilon = 216.L/24389.L,
kappa = 24389.L/27.L;
// CIELab -> XYZ
yr = (lab[0]<=kappa*epsilon) ?
(lab[0]/kappa) : (pow((lab[0]+16.0)/116.0, 3.0));
// fy = (yr<=epsilon) ? ((kappa*yr+16.0)/116.0) : ((lab[0]+16.0)/116.0);
fy = ( lab[0]+16.)/116.;
fz = fy - lab[2]/200.0;
fx = lab[1]/500.0 + fy;
zr = (pow(fz, 3.0)<=epsilon) ? ((116.0*fz-16.0)/kappa) : (pow(fz, 3.0));
xr = (pow(fx, 3.0)<=epsilon) ? ((116.0*fx-16.0)/kappa) : (pow(fx, 3.0));
xyz[0] = xr*illuminant[0];
xyz[1] = yr*illuminant[1];
xyz[2] = zr*illuminant[2];
// XYZ -> RGB
for (c=0; c<3; c++) {
tmpf = 0;
for (cc=0; cc<3; cc++)
tmpf += rgb_xyz[c][cc] * xyz[cc];
rgb[c] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5;
if ( rgb[c] > signed(QuantumRange) ) rgb[c] = QuantumRange;
}
}
*/
#define RGB_to_CIELab(rgb,lab) \
{ \
const double epsilon = 216./24389., \
kappa = 24389./27.; \
double xyz[3] = { 0., 0., 0. }; \
xyz[0] += xyz_rgb[0][0] * (double(rgb[0])/65535.);\
xyz[1] += xyz_rgb[1][0] * (double(rgb[0])/65535.);\
xyz[2] += xyz_rgb[2][0] * (double(rgb[0])/65535.);\
xyz[0] += xyz_rgb[0][1] * (double(rgb[1])/65535.);\
xyz[1] += xyz_rgb[1][1] * (double(rgb[1])/65535.);\
xyz[2] += xyz_rgb[2][1] * (double(rgb[1])/65535.);\
xyz[0] += xyz_rgb[0][2] * (double(rgb[2])/65535.);\
xyz[1] += xyz_rgb[1][2] * (double(rgb[2])/65535.);\
xyz[2] += xyz_rgb[2][2] * (double(rgb[2])/65535.);\
double xr = xyz[0]/illuminant[0]; \
double yr = xyz[1]/illuminant[1]; \
double zr = xyz[2]/illuminant[2]; \
double fx = xr > epsilon ? pow(xr,1./3.) : ( kappa * xr + 16. ) / 116.;\
double fy = yr > epsilon ? pow(yr,1./3.) : ( kappa * yr + 16. ) / 116.;\
double fz = zr > epsilon ? pow(zr,1./3.) : ( kappa * zr + 16. ) / 116.;\
lab[0] = 116. * fy - 16.;\
lab[1] = 500. * (fx - fy);\
lab[2] = 200. * (fy - fz);\
}
#define CIELab_to_RGB(lab,rgb) \
{ \
double xyz[3], fx, fy, fz, xr, yr, zr, tmpf; \
const double epsilon = 216.L/24389.L, \
kappa = 24389.L/27.L; \
yr = (lab[0]<=kappa*epsilon) ? \
(lab[0]/kappa) : (pow((lab[0]+16.0)/116.0, 3.0)); \
fy = ( lab[0]+16.)/116.; \
fz = fy - lab[2]/200.0; \
fx = lab[1]/500.0 + fy; \
zr = (pow(fz, 3.0)<=epsilon) ? ((116.0*fz-16.0)/kappa) : (pow(fz, 3.0)); \
xr = (pow(fx, 3.0)<=epsilon) ? ((116.0*fx-16.0)/kappa) : (pow(fx, 3.0)); \
xyz[0] = xr*illuminant[0]; \
xyz[1] = yr*illuminant[1]; \
xyz[2] = zr*illuminant[2]; \
tmpf = 0; \
tmpf += rgb_xyz[0][0] * xyz[0]; \
tmpf += rgb_xyz[0][1] * xyz[1]; \
tmpf += rgb_xyz[0][2] * xyz[2]; \
rgb[0] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5; \
if ( rgb[0] > QuantumRange ) rgb[0] = QuantumRange; \
tmpf = 0; \
tmpf += rgb_xyz[1][0] * xyz[0]; \
tmpf += rgb_xyz[1][1] * xyz[1]; \
tmpf += rgb_xyz[1][2] * xyz[2]; \
rgb[1] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5; \
if ( rgb[1] > QuantumRange ) rgb[1] = QuantumRange; \
tmpf = 0; \
tmpf += rgb_xyz[2][0] * xyz[0]; \
tmpf += rgb_xyz[2][1] * xyz[1]; \
tmpf += rgb_xyz[2][2] * xyz[2]; \
rgb[2] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5; \
if ( rgb[2] > QuantumRange ) rgb[2] = QuantumRange; \
}
//QuantumRange is defined as Quantum which is not in scope
using MagickCore::Quantum;
static void lab_to_int(const double lab[3], quantum_t lab16[3]) {
lab16[0]=lab[0]*65535.L/100.L;
lab16[1]=(lab[1]+120.L)*65535.L/240.L;
lab16[2]=(lab[2]+120.L)*65535.L/240.L;
}
static void int_to_lab(const quantum_t lab16[3], double lab[3]) {
lab[0] = double(lab16[0])*100.L/65535.L;
lab[1] = double(lab16[1])*240.L/65535.L-120;
lab[2] = double(lab16[2])*240.L/65535.L-120;
}
static void RGB_to_CIELab16(const quantum_t rgb[3], quantum_t lab16[3] ) {
double lab[3];
RGB_to_CIELab(rgb,lab);
lab_to_int(lab,lab16);
}
static void CIELab16_to_RGB(const quantum_t lab16[3], quantum_t rgb[3] ) {
double lab[3];
int_to_lab(lab16,lab);
CIELab_to_RGB(lab,rgb);
}
/*
static double lab_linearize(double l) {
const double epsilon = 216.L/24389.L, kappa = 24389.L/27.L;
return (l<=kappa*epsilon) ?
(l/kappa) : (pow((l+16.0)/116.0, 3.0));
}
static double lab_gammaize(double v) {
const double epsilon = 216.L/24389.L, kappa = 24389.L/27.L;
return 116. * ( v > epsilon ? pow(v,1./3.) : ( kappa * v + 16. ) / 116. ) - 16.;
}
*/
#define lab_linearize(l) ({ \
const double epsilon = 216.L/24389.L, kappa = 24389.L/27.L; \
double __ret = (l<=kappa*epsilon) ? \
(l/kappa) : (pow((l+16.0)/116.0, 3.0)); \
__ret; })
#define lab_gammaize(v) ({ \
const double epsilon = 216.L/24389.L, kappa = 24389.L/27.L; \
double __ret = 116. * ( v > epsilon ? pow(v,1./3.) : ( kappa * v + 16. ) / 116. ) - 16.; \
__ret; })
/**
* @param rgb int[3] linear [0..65535]
* @param[out] lab double[3] Lab [0..1,-120..120,-120..120]
*/
#define RGB_to_LinearLab(rgb,lab) \
{ \
const double epsilon = 216./24389., \
kappa = 24389./27.; \
double xyz[3] = { 0., 0., 0. }; \
xyz[0] += xyz_rgb[0][0] * (double(rgb[0])/65535.);\
xyz[1] += xyz_rgb[1][0] * (double(rgb[0])/65535.);\
xyz[2] += xyz_rgb[2][0] * (double(rgb[0])/65535.);\
xyz[0] += xyz_rgb[0][1] * (double(rgb[1])/65535.);\
xyz[1] += xyz_rgb[1][1] * (double(rgb[1])/65535.);\
xyz[2] += xyz_rgb[2][1] * (double(rgb[1])/65535.);\
xyz[0] += xyz_rgb[0][2] * (double(rgb[2])/65535.);\
xyz[1] += xyz_rgb[1][2] * (double(rgb[2])/65535.);\
xyz[2] += xyz_rgb[2][2] * (double(rgb[2])/65535.);\
double xr = xyz[0]/illuminant[0]; \
double yr = xyz[1]/illuminant[1]; \
double zr = xyz[2]/illuminant[2]; \
double fx = xr > epsilon ? pow(xr,1./3.) : ( kappa * xr + 16. ) / 116.; \
double fy = yr > epsilon ? pow(yr,1./3.) : ( kappa * yr + 16. ) / 116.; \
double fz = zr > epsilon ? pow(zr,1./3.) : ( kappa * zr + 16. ) / 116.; \
lab[0] = yr; \
lab[1] = 500. * (fx - fy); \
lab[2] = 200. * (fy - fz); \
}
/**
* @param lab double[3] Lab [0..1,-120..120,-120..120]
* @param[out] rgb int[3] linear [0..65535]
*/
#define LinearLab_to_RGB(lab,rgb) \
{ \
double xyz[3], fx, fy, fz, xr, yr, zr, tmpf; \
const double epsilon = 216.L/24389.L, \
kappa = 24389.L/27.L; \
yr = lab[0]; \
fy = yr > epsilon ? pow(yr,1./3.) : ( kappa * yr + 16. ) / 116.; \
fz = fy - lab[2]/200.0; \
fx = lab[1]/500.0 + fy; \
zr = (pow(fz, 3.0)<=epsilon) ? ((116.0*fz-16.0)/kappa) : (pow(fz, 3.0)); \
xr = (pow(fx, 3.0)<=epsilon) ? ((116.0*fx-16.0)/kappa) : (pow(fx, 3.0)); \
xyz[0] = xr*illuminant[0]; \
xyz[1] = yr*illuminant[1]; \
xyz[2] = zr*illuminant[2]; \
tmpf = 0; \
tmpf += rgb_xyz[0][0] * xyz[0]; \
tmpf += rgb_xyz[0][1] * xyz[1]; \
tmpf += rgb_xyz[0][2] * xyz[2]; \
rgb[0] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5; \
if ( rgb[0] > QuantumRange ) rgb[0] = QuantumRange; \
tmpf = 0; \
tmpf += rgb_xyz[1][0] * xyz[0]; \
tmpf += rgb_xyz[1][1] * xyz[1]; \
tmpf += rgb_xyz[1][2] * xyz[2]; \
rgb[1] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5; \
if ( rgb[1] > QuantumRange ) rgb[1] = QuantumRange; \
tmpf = 0; \
tmpf += rgb_xyz[2][0] * xyz[0]; \
tmpf += rgb_xyz[2][1] * xyz[1]; \
tmpf += rgb_xyz[2][2] * xyz[2]; \
rgb[2] = ( tmpf<0?0:tmpf ) * 65535.0 + 0.5; \
if ( rgb[2] > QuantumRange ) rgb[2] = QuantumRange; \
}