001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.imaging.formats.tiff.photometricinterpreters; 018 019import java.io.IOException; 020 021import org.apache.commons.imaging.ImageReadException; 022import org.apache.commons.imaging.common.ImageBuilder; 023 024public class PhotometricInterpreterLogLuv extends PhotometricInterpreter { 025 // private final boolean yOnly; 026 027 public PhotometricInterpreterLogLuv(final int samplesPerPixel, 028 final int[] bitsPerSample, final int predictor, final int width, final int height) { 029 super(samplesPerPixel, bitsPerSample, predictor, width, height); 030 031 // this.yOnly = yonly; 032 } 033 034 private float cube(final float f) { 035 return f * f * f; 036 } 037 038 // private float function_f(float value, ) 039 040 @Override 041 public void interpretPixel(final ImageBuilder imageBuilder, final int[] samples, final int x, 042 final int y) throws ImageReadException, IOException { 043 float X, Y, Z; 044 045 final int cieL = samples[0]; 046 final int cieA = (byte) samples[1]; 047 final int cieB = (byte) samples[2]; 048 049 { 050 051 float var_Y = ((cieL * 100.0f / 255.0f) + 16.0f) / 116.0f; 052 float var_X = cieA / 500.0f + var_Y; 053 float var_Z = var_Y - cieB / 200.0f; 054 055 final float var_x_cube = cube(var_X); 056 final float var_y_cube = cube(var_Y); 057 final float var_z_cube = cube(var_Z); 058 059 if (var_y_cube > 0.008856f) { 060 var_Y = var_y_cube; 061 } else { 062 var_Y = (var_Y - 16 / 116.0f) / 7.787f; 063 } 064 065 if (var_x_cube > 0.008856f) { 066 var_X = var_x_cube; 067 } else { 068 var_X = (var_X - 16 / 116.0f) / 7.787f; 069 } 070 071 if (var_z_cube > 0.008856f) { 072 var_Z = var_z_cube; 073 } else { 074 var_Z = (var_Z - 16 / 116.0f) / 7.787f; 075 } 076 077 final float ref_X = 95.047f; 078 final float ref_Y = 100.000f; 079 final float ref_Z = 108.883f; 080 081 X = ref_X * var_X; // ref_X = 95.047 Observer= 2°, Illuminant= D65 082 Y = ref_Y * var_Y; // ref_Y = 100.000 083 Z = ref_Z * var_Z; // ref_Z = 108.883 084 085 } 086 087 // ref_X = 95.047 //Observer = 2°, Illuminant = D65 088 // ref_Y = 100.000 089 // ref_Z = 108.883 090 091 int R, G, B; 092 { 093 final float var_X = X / 100f; // X = From 0 to ref_X 094 final float var_Y = Y / 100f; // Y = From 0 to ref_Y 095 final float var_Z = Z / 100f; // Z = From 0 to ref_Y 096 097 float var_R = var_X * 3.2406f + var_Y * -1.5372f + var_Z * -0.4986f; 098 float var_G = var_X * -0.9689f + var_Y * 1.8758f + var_Z * 0.0415f; 099 float var_B = var_X * 0.0557f + var_Y * -0.2040f + var_Z * 1.0570f; 100 101 if (var_R > 0.0031308) { 102 var_R = 1.055f * (float) Math.pow(var_R, (1 / 2.4)) - 0.055f; 103 } else { 104 var_R = 12.92f * var_R; 105 } 106 if (var_G > 0.0031308) { 107 var_G = 1.055f * (float) Math.pow(var_G, (1 / 2.4)) - 0.055f; 108 } else { 109 var_G = 12.92f * var_G; 110 } 111 112 if (var_B > 0.0031308) { 113 var_B = 1.055f * (float) Math.pow(var_B, (1 / 2.4)) - 0.055f; 114 } else { 115 var_B = 12.92f * var_B; 116 } 117 118 // var_R = (((var_R-))) 119 // updateMaxMin(new float[]{ 120 // var_R, var_G, var_B, 121 // }, maxVarRGB, minVarRGB); 122 123 // var_R = ((var_R + 0.16561039f) / (3.0152583f + 0.16561039f)); 124 // var_G = ((var_G + 0.06561642f) / (3.0239854f + 0.06561642f)); 125 // var_B = ((var_B + 0.19393992f) / (3.1043448f + 0.19393992f)); 126 127 R = (int) (var_R * 255f); 128 G = (int) (var_G * 255f); 129 B = (int) (var_B * 255f); 130 } 131 132 // float R = 1.910f * X - 0.532f * Y - 0.288f * Z; 133 // float G = -0.985f * X + 1.999f * Y - 0.028f * Z; 134 // float B = 0.058f * X - 0.118f * Y + 0.898f * Z; 135 136 // updateMaxMin(new float[]{ 137 // R, G, B, 138 // }, maxRGB, minRGB); 139 140 int red = R; 141 int green = G; 142 int blue = B; 143 144 red = Math.min(255, Math.max(0, red)); 145 green = Math.min(255, Math.max(0, green)); 146 blue = Math.min(255, Math.max(0, blue)); 147 final int alpha = 0xff; 148 final int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0); 149 imageBuilder.setRGB(x, y, rgb); 150 151 } 152}