svn-gvsig-desktop / tags / v1_0_1_RELEASE / libraries / libCq CMS for java.old / src / org / cresques / filter / ColorSpaceConversion.java @ 9531
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/*
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* Cresques Mapping Suite. Graphic Library for constructing mapping applications.
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*
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* Copyright (C) 2004-5.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* cresques@gmail.com
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*/
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package org.cresques.filter; |
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/**
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*
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* @author Nacho Brodin (brodin_ign@gva.es)
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*/
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public class ColorSpaceConversion { |
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public static int H = 0, R = 0; |
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public static int S = 1, G = 1; |
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public static int L = 2, B = 2; |
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/**
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* Convierte HSL a RGB
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* @param h hue
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* @param s saturation
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* @param l ligthness
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* @return
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*/
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public static int[] HSLtoRGB(int h, int s, int i){ |
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double red; /* the red band output */ |
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double red255; /* the red band output */ |
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double green; /* the green band output */ |
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double green255; /* the green band output */ |
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double blue; /* the blue band output */ |
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double blue255; /* the blue band output */ |
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double m1; /* value used for determining RGB */ |
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double m2; /* value used for determining RGB */ |
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double scalei; /* intensity value */ |
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double scales; /* saturation value */ |
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double hue; /* hue */ |
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double savehue; /* save the hue for future processing */ |
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int[] res = new int[3]; |
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if(h == s && h == 0){ |
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res[0] = res[1] = res[2] = i; |
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return res;
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} |
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red = green = blue = 0.0;
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scalei = (double) (i / 255.0); |
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scales = (double) (s / 255.0); |
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m2 = 0.0;
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if (scalei <= 0.50) |
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m2 = scalei*(1.0 + scales);
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else if (scalei > 0.50) |
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m2 = scalei+scales-(scalei*scales); |
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m1 = 2.0 * scalei - m2;
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hue = (double) 360.0 * h / 255.0; |
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if (scales == 0.0){ |
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if (hue == -1.0){ |
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red = scalei; |
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green = scalei; |
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blue = scalei; |
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} |
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}else{
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savehue = hue + 120.0;
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if (savehue > 360.0) |
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savehue -= 360.0;
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if (savehue < 0.0) |
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savehue += 360.0;
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if (savehue < 60.0) |
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red = m1 + (m2-m1) * savehue/60.0;
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else if (savehue < 180.0) |
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red = m2; |
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else if (savehue < 240.0) |
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red = m1 + (m2-m1) * (240.0-savehue)/60.0; |
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else
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red = m1; |
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savehue = hue; |
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if (savehue > 360.0) |
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savehue -= 360.0;
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if (savehue < 0.0) |
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savehue += 360.0;
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if (savehue < 60.0) |
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green = m1 + (m2-m1) * savehue/60.0;
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else if (savehue < 180.0) |
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green = m2; |
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else if (savehue < 240.0) |
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green = m1 + (m2-m1) * (240.0-savehue)/60.0; |
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else
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green = m1; |
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savehue = hue - 120.0;
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if (savehue > 360.0) |
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savehue -= 360.0;
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if (savehue < 0.0) |
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savehue += 360.0;
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if (savehue < 60.0) |
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blue = m1 + (m2-m1) * savehue/60.0;
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else if (savehue < 180.0) |
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blue = m2; |
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else if (savehue < 240.0) |
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blue = m1 + (m2-m1) * (240.0-savehue)/60.0; |
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else
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blue = m1; |
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} |
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red255 = red*255.0;
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green255 = green*255.0;
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blue255 = blue*255.0;
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if (red255 > 255.0) |
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red = 255.0;
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else
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red = red255; |
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if (green255 > 255.0) |
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green = 255.0;
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else
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green = green255; |
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if (blue255 > 255.0) |
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blue = 255.0;
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else
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blue = blue255; |
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if (red > 254.5) red = 254.5; |
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if (red < 0.0) red = 0.0; |
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if (green > 254.5) green = 254.5; |
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if (green < 0.0) green = 0.0; |
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if (blue > 254.5) blue = 254.5; |
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if (blue < 0.0) blue = 0.0; |
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res[0] = (int) (red + 0.5); |
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res[1] = (int) (green +0.5); |
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res[2] = (int) (blue + 0.5); |
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return res;
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} |
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/**
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* Convierte RGB a HSL
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* @param r red
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* @param g green
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* @param b blue
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* @return
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*/
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public static double[] RGBtoHSL(int rojo, int verde, int azul){ |
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double scaler, scaleg, scaleb;
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double sat;
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double red, green, blue;
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double low, high, intens;
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double hue=0.0; |
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double[] res1 = new double[3]; |
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scaler = (double) (rojo / 255.0); |
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scaleg = (double) (verde / 255.0); |
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scaleb = (double) (azul / 255.0); |
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high = scaler; |
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if (scaleg > high)
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high = scaleg; |
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if (scaleb > high)
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high = scaleb; |
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low = scaler; |
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if (scaleg < low)
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low = scaleg; |
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if (scaleb < low)
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low = scaleb; |
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intens = ((high + low) / 2.0);
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if (high == low){
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sat = 0.0;
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hue = 0.0;
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res1[0] = (double) hue; |
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res1[2] = (double) intens; |
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res1[1] = (double) sat; |
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}else if (high != low){ |
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if (intens <= 0.5) |
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sat = (high-low)/(high+low); |
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else
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sat = (high-low)/(2 - high - low);
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red = (high-scaler)/(high-low); |
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green = (high-scaleg)/(high-low); |
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blue =(high-scaleb)/(high-low); |
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if (scaler == high)
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hue = blue - green; |
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else
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if (scaleg == high)
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hue = 2 + red - blue;
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else
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if (scaleb == high)
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hue = 4 + green - red;
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hue *= 60.0;
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if (hue < 0.0) |
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hue += 360.0;
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//res[0] = (byte)(255.0 * hue / 360.0 + 0.5);
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//res[1] = (byte) (intens*255. + 0.5);
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//res[2] = (byte) (sat*255. + 0.5);
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res1[0] = (double)(hue); |
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res1[2] = (double) (intens); |
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res1[1] = (double) (sat); |
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} |
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return res1;
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} |
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} |