88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/*
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* This file is part of RawTherapee.
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*
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* Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
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*
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* RawTherapee is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* RawTherapee is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with RawTherapee. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <colortemp.h>
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using namespace rtengine;
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ColorTemp::ColorTemp (double t, double g) : temp(t), green(g) {
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clip (temp, green);
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}
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void ColorTemp::clip (double &temp, double &green) {
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if (temp < MINTEMP)
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temp = MINTEMP;
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else if (temp > MAXTEMP)
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temp = MAXTEMP;
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if (green < MINGREEN)
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green = MINGREEN;
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else if (green > MAXGREEN)
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green = MAXGREEN;
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}
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void ColorTemp::mul2temp (double rmul, double gmul, double bmul, double& temp, double& green) {
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double maxtemp=20000, mintemp=1000;
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double tmpr, tmpg, tmpb;
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temp=(maxtemp+mintemp)/2;
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while (maxtemp-mintemp>1) {
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temp2mul (temp, 1.0, tmpr, tmpg, tmpb);
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if (tmpb/tmpr > bmul/rmul)
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maxtemp = temp;
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else
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mintemp = temp;
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temp=(maxtemp+mintemp)/2;
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}
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green = (tmpg/tmpr) / (gmul/rmul);
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clip (temp, green);
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}
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void ColorTemp::temp2mul (double temp, double green, double& rmul, double& gmul, double& bmul) {
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clip (temp, green);
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double xD;
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if (temp<=4000) {
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xD = 0.27475e9/(temp*temp*temp) - 0.98598e6/(temp*temp) + 1.17444e3/temp + 0.145986;
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} else if (temp<=7000) {
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xD = -4.6070e9/(temp*temp*temp) + 2.9678e6/(temp*temp) + 0.09911e3/temp + 0.244063;
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} else {
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xD = -2.0064e9/(temp*temp*temp) + 1.9018e6/(temp*temp) + 0.24748e3/temp + 0.237040;
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}
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double yD = -3.0*xD*xD + 2.87*xD - 0.275;
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double X = xD/yD;
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double Y = 1.0;
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double Z = (1.0-xD-yD)/yD;
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rmul = X * 3.24071 - Y * 1.53726 - Z * 0.498571;
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gmul = - X * 0.969258 + Y * 1.87599 + Z * 0.0415557;
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bmul = X * 0.0556352 - Y * 0.203996 + Z * 1.05707;
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gmul /= green;
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double max = rmul;
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if (gmul>max) max = gmul;
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if (bmul>max) max = bmul;
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rmul /= max;
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gmul /= max;
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bmul /= max;
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}
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