68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/* -*- C++ -*-
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*
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* This file is part of RawTherapee.
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*
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* Ported from G'MIC by Alberto Griggio <alberto.griggio@gmail.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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#ifdef _OPENMP
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#include <omp.h>
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#endif
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#include "improcfun.h"
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#include "settings.h"
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#include "gauss.h"
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#include "boxblur.h"
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#include "array2D.h"
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namespace rtengine {
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void ImProcFunctions::localContrast(LabImage *lab)
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{
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if (!params->localContrast.enabled) {
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return;
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}
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const int width = lab->W;
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const int height = lab->H;
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const float a = -params->localContrast.amount;
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const float half = 0.5f;
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const float dark = params->localContrast.darkness;
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const float light = params->localContrast.lightness;
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array2D<float> buf(width, height);
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const float sigma = params->localContrast.radius / scale;
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gaussianBlur(lab->L, buf, width, height, sigma);
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#ifdef _OPENMP
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#pragma omp parallel for
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#endif
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for (int y = 0; y < height; ++y) {
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for (int x = 0; x < width; ++x) {
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buf[y][x] -= lab->L[y][x];
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buf[y][x] *= a;
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if (dark != 1 || light != 1) {
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buf[y][x] = max(buf[y][x], half) * light + min(buf[y][x], half) * dark;
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}
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lab->L[y][x] += buf[y][x];
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}
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}
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}
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} // namespace rtengine
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