71 lines
1.9 KiB
C++
71 lines
1.9 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 <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "color.h"
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#include "curves.h"
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namespace rtengine
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{
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class SatAndValueBlendingToneCurve : public ToneCurve
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{
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public:
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void Apply(float& r, float& g, float& b) const;
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};
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// Tone curve modifying the value channel only, preserving hue and saturation
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// values in 0xffff space
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inline void SatAndValueBlendingToneCurve::Apply (float& ir, float& ig, float& ib) const
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{
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assert (lutToneCurve);
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float r = CLIP(ir);
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float g = CLIP(ig);
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float b = CLIP(ib);
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const float lum = (r + g + b) / 3.f;
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const float newLum = lutToneCurve[lum];
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if (newLum == lum) {
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return;
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}
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float h, s, v;
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Color::rgb2hsvtc(r, g, b, h, s, v);
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float dV;
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if (newLum > lum) {
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// Linearly targeting Value = 1 and Saturation = 0
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const float coef = (newLum - lum) / (65535.f - lum);
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dV = (1.f - v) * coef;
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s *= 1.f - coef;
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} else {
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// Linearly targeting Value = 0
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const float coef = (newLum - lum) / lum ;
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dV = v * coef;
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}
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Color::hsv2rgbdcp(h, s, v + dV, r, g, b);
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setUnlessOOG(ir, ig, ib, r, g, b);
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}
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}
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