svn-gvsig-desktop / tags / v1_0_2_Build_896 / libraries / libCq CMS for java.old / src / org / cresques / filter / ColorSpaceConversion.java @ 10391
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1 | 5978 | nacho | /*
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2 | * Cresques Mapping Suite. Graphic Library for constructing mapping applications.
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3 | *
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4 | * Copyright (C) 2004-5.
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5 | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | * as published by the Free Software Foundation; either version 2
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9 | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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19 | *
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20 | * For more information, contact:
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21 | *
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22 | * cresques@gmail.com
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23 | */
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24 | package org.cresques.filter; |
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25 | |||
26 | |||
27 | |||
28 | /**
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29 | *
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30 | * @author Nacho Brodin (brodin_ign@gva.es)
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31 | */
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32 | |||
33 | public class ColorSpaceConversion { |
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34 | public static int H = 0, R = 0; |
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35 | public static int S = 1, G = 1; |
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36 | public static int L = 2, B = 2; |
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37 | |||
38 | |||
39 | /**
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40 | * Convierte HSL a RGB
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41 | * @param h hue
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42 | * @param s saturation
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43 | * @param l ligthness
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44 | * @return
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45 | */
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46 | public static int[] HSLtoRGB(int h, int s, int i){ |
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47 | double red; /* the red band output */ |
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48 | double red255; /* the red band output */ |
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49 | double green; /* the green band output */ |
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50 | double green255; /* the green band output */ |
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51 | double blue; /* the blue band output */ |
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52 | double blue255; /* the blue band output */ |
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53 | double m1; /* value used for determining RGB */ |
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54 | double m2; /* value used for determining RGB */ |
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55 | double scalei; /* intensity value */ |
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56 | double scales; /* saturation value */ |
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57 | double hue; /* hue */ |
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58 | double savehue; /* save the hue for future processing */ |
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59 | int[] res = new int[3]; |
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60 | |||
61 | if(h == s && h == 0){ |
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62 | res[0] = res[1] = res[2] = i; |
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63 | return res;
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64 | } |
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65 | |||
66 | red = green = blue = 0.0;
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67 | scalei = (double) (i / 255.0); |
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68 | scales = (double) (s / 255.0); |
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69 | m2 = 0.0;
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70 | |||
71 | if (scalei <= 0.50) |
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72 | m2 = scalei*(1.0 + scales);
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73 | else if (scalei > 0.50) |
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74 | m2 = scalei+scales-(scalei*scales); |
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75 | m1 = 2.0 * scalei - m2;
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76 | |||
77 | hue = (double) 360.0 * h / 255.0; |
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78 | |||
79 | if (scales == 0.0){ |
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80 | if (hue == -1.0){ |
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81 | red = scalei; |
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82 | green = scalei; |
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83 | blue = scalei; |
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84 | } |
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85 | }else{
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86 | savehue = hue + 120.0;
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87 | if (savehue > 360.0) |
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88 | savehue -= 360.0;
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89 | if (savehue < 0.0) |
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90 | savehue += 360.0;
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91 | if (savehue < 60.0) |
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92 | red = m1 + (m2-m1) * savehue/60.0;
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93 | else if (savehue < 180.0) |
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94 | red = m2; |
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95 | else if (savehue < 240.0) |
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96 | red = m1 + (m2-m1) * (240.0-savehue)/60.0; |
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97 | else
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98 | red = m1; |
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99 | |||
100 | savehue = hue; |
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101 | if (savehue > 360.0) |
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102 | savehue -= 360.0;
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103 | if (savehue < 0.0) |
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104 | savehue += 360.0;
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105 | if (savehue < 60.0) |
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106 | green = m1 + (m2-m1) * savehue/60.0;
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107 | else if (savehue < 180.0) |
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108 | green = m2; |
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109 | else if (savehue < 240.0) |
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110 | green = m1 + (m2-m1) * (240.0-savehue)/60.0; |
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111 | else
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112 | green = m1; |
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113 | |||
114 | |||
115 | savehue = hue - 120.0;
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116 | if (savehue > 360.0) |
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117 | savehue -= 360.0;
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118 | if (savehue < 0.0) |
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119 | savehue += 360.0;
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120 | if (savehue < 60.0) |
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121 | blue = m1 + (m2-m1) * savehue/60.0;
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122 | else if (savehue < 180.0) |
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123 | blue = m2; |
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124 | else if (savehue < 240.0) |
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125 | blue = m1 + (m2-m1) * (240.0-savehue)/60.0; |
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126 | else
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127 | blue = m1; |
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128 | } |
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129 | |||
130 | red255 = red*255.0;
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131 | green255 = green*255.0;
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132 | blue255 = blue*255.0;
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133 | if (red255 > 255.0) |
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134 | red = 255.0;
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135 | else
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136 | red = red255; |
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137 | if (green255 > 255.0) |
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138 | green = 255.0;
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139 | else
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140 | green = green255; |
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141 | if (blue255 > 255.0) |
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142 | blue = 255.0;
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143 | else
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144 | blue = blue255; |
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145 | |||
146 | if (red > 254.5) red = 254.5; |
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147 | if (red < 0.0) red = 0.0; |
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148 | if (green > 254.5) green = 254.5; |
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149 | if (green < 0.0) green = 0.0; |
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150 | if (blue > 254.5) blue = 254.5; |
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151 | if (blue < 0.0) blue = 0.0; |
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152 | |||
153 | res[0] = (int) (red + 0.5); |
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154 | res[1] = (int) (green +0.5); |
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155 | res[2] = (int) (blue + 0.5); |
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156 | return res;
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157 | } |
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158 | |||
159 | /**
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160 | * Convierte RGB a HSL
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161 | * @param r red
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162 | * @param g green
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163 | * @param b blue
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164 | * @return
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165 | */
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166 | public static double[] RGBtoHSL(int rojo, int verde, int azul){ |
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167 | double scaler, scaleg, scaleb;
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168 | double sat;
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169 | double red, green, blue;
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170 | double low, high, intens;
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171 | double hue=0.0; |
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172 | double[] res1 = new double[3]; |
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173 | |||
174 | scaler = (double) (rojo / 255.0); |
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175 | scaleg = (double) (verde / 255.0); |
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176 | scaleb = (double) (azul / 255.0); |
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177 | |||
178 | high = scaler; |
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179 | |||
180 | if (scaleg > high)
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181 | high = scaleg; |
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182 | if (scaleb > high)
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183 | high = scaleb; |
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184 | low = scaler; |
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185 | if (scaleg < low)
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186 | low = scaleg; |
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187 | if (scaleb < low)
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188 | low = scaleb; |
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189 | |||
190 | intens = ((high + low) / 2.0);
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191 | if (high == low){
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192 | sat = 0.0;
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193 | hue = 0.0;
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194 | res1[0] = (double) hue; |
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195 | res1[2] = (double) intens; |
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196 | res1[1] = (double) sat; |
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197 | }else if (high != low){ |
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198 | if (intens <= 0.5) |
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199 | sat = (high-low)/(high+low); |
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200 | else
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201 | sat = (high-low)/(2 - high - low);
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202 | |||
203 | red = (high-scaler)/(high-low); |
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204 | green = (high-scaleg)/(high-low); |
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205 | blue =(high-scaleb)/(high-low); |
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206 | |||
207 | if (scaler == high)
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208 | hue = blue - green; |
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209 | else
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210 | if (scaleg == high)
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211 | hue = 2 + red - blue;
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212 | else
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213 | if (scaleb == high)
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214 | hue = 4 + green - red;
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215 | |||
216 | hue *= 60.0;
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217 | |||
218 | if (hue < 0.0) |
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219 | hue += 360.0;
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220 | |||
221 | //res[0] = (byte)(255.0 * hue / 360.0 + 0.5);
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222 | //res[1] = (byte) (intens*255. + 0.5);
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223 | //res[2] = (byte) (sat*255. + 0.5);
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224 | res1[0] = (double)(hue); |
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225 | res1[2] = (double) (intens); |
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226 | res1[1] = (double) (sat); |
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227 | } |
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228 | return res1;
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229 | } |
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230 | } |