00001 /*************************************************************************** 00002 * Copyright (C) 1998-2009 by authors (see AUTHORS.txt ) * 00003 * * 00004 * This file is part of LuxRender. * 00005 * * 00006 * Lux Renderer is free software; you can redistribute it and/or modify * 00007 * it under the terms of the GNU General Public License as published by * 00008 * the Free Software Foundation; either version 3 of the License, or * 00009 * (at your option) any later version. * 00010 * * 00011 * Lux Renderer is distributed in the hope that it will be useful, * 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 00014 * GNU General Public License for more details. * 00015 * * 00016 * You should have received a copy of the GNU General Public License * 00017 * along with this program. If not, see <http://www.gnu.org/licenses/>. * 00018 * * 00019 * This project is based on PBRT ; see http://www.pbrt.org * 00020 * Lux Renderer website : http://www.luxrender.net * 00021 ***************************************************************************/ 00022 00023 // highcontrast.cpp* 00024 #include "tonemap.h" 00025 #include "mipmap.h" 00026 00027 namespace lux 00028 { 00029 00030 // HighContrastOp Declarations 00031 class HighContrastOp : public ToneMap { 00032 public: 00033 virtual ~HighContrastOp() { } 00034 virtual void Map(vector<XYZColor> &xyz, int xRes, int yRes, float maxDisplayY) const; 00035 00036 static ToneMap *CreateToneMap(const ParamSet &ps); 00037 private: 00038 // HighContrastOp Utility Methods 00039 static float C(float y) { 00040 if (y < 0.0034f) 00041 return y / 0.0014f; 00042 else if (y < 1.f) 00043 return 2.4483f + log10f(y / 0.0034f) / 0.4027f; 00044 else if (y < 7.2444f) 00045 return 16.563f + (y - 1.f) / 0.4027f; 00046 else 00047 return 32.0693f + log10f(y / 7.2444f) / 0.0556f; 00048 } 00049 static float T(float y, float CYmin, float CYmax) { 00050 return (C(y) - CYmin) / (CYmax - CYmin); 00051 } 00052 }; 00053 00054 }//namespace lux 00055