/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.sanselan.color;
import org.apache.sanselan.util.Debug;
public abstract class ColorConversions
{
public final static void main(String args[])
{
try
{
{
for (int C = 0; C <= 256; C += 64)
for (int M = 0; M <= 256; M += 64)
for (int Y = 0; Y <= 256; Y += 64)
for (int K = 0; K <= 256; K += 64)
{
int rgb1 = ColorConversions.convertCMYKtoRGB(
Math.min(255, C), Math.min(255, M),
Math.min(255, Y), Math.min(255, K));
int rgb2 = ColorConversions
.convertCMYKtoRGB_old(Math.min(255, C),
Math.min(255, M), Math.min(255,
Y), Math.min(255, K));
if (rgb1 != rgb2)
{
Debug.debug();
Debug.debug("C", C);
Debug.debug("M", M);
Debug.debug("Y", Y);
Debug.debug("K", K);
Debug.debug("rgb1", rgb1 + " ("
+ Integer.toHexString(rgb1) + ")");
Debug.debug("rgb2", rgb2 + " ("
+ Integer.toHexString(rgb2) + ")");
}
}
}
int sample_rgbs[] = {
0xffffffff, //
0xff000000, //
0xffff0000, //
0xff00ff00, //
0xff0000ff, //
0xffff00ff, //
0xfff0ff00, //
0xff00ffff, //
0x00000000, //
0xff7f7f7f, //
};
for (int i = 0; i < sample_rgbs.length; i++)
{
int rgb = sample_rgbs[i];
ColorXYZ xyz;
{
xyz = ColorConversions.convertRGBtoXYZ(rgb);
int xyz_rgb = ColorConversions.convertXYZtoRGB(xyz);
Debug.debug();
Debug.debug("rgb", rgb + " (" + Integer.toHexString(rgb)
+ ")");
Debug.debug("xyz", xyz);
Debug.debug("xyz_rgb", xyz_rgb + " ("
+ Integer.toHexString(xyz_rgb) + ")");
if ((0xffffff & xyz_rgb) != (0xffffff & rgb))
Debug.debug("!!!!!!!!!!!!!!!!!!!!!!!");
}
ColorCIELab cielab;
{
cielab = ColorConversions.convertXYZtoCIELab(xyz);
ColorXYZ cielab_xyz = ColorConversions
.convertCIELabtoXYZ(cielab);
int cielab_xyz_rgb = ColorConversions
.convertXYZtoRGB(cielab_xyz);
Debug.debug("cielab", cielab);
Debug.debug("cielab_xyz", cielab_xyz);
Debug.debug("cielab_xyz_rgb", cielab_xyz_rgb + " ("
+ Integer.toHexString(cielab_xyz_rgb) + ")");
if ((0xffffff & cielab_xyz_rgb) != (0xffffff & rgb))
Debug.debug("!!!!!!!!!!!!!!!!!!!!!!!");
}
{
ColorHunterLab hunterlab = ColorConversions
.convertXYZtoHunterLab(xyz);
ColorXYZ hunterlab_xyz = ColorConversions
.convertHunterLabtoXYZ(hunterlab);
int hunterlab_xyz_rgb = ColorConversions
.convertXYZtoRGB(hunterlab_xyz);
Debug.debug("hunterlab", hunterlab);
Debug.debug("hunterlab_xyz", hunterlab_xyz);
Debug.debug("hunterlab_xyz_rgb", hunterlab_xyz_rgb + " ("
+ Integer.toHexString(hunterlab_xyz_rgb) + ")");
if ((0xffffff & hunterlab_xyz_rgb) != (0xffffff & rgb))
Debug.debug("!!!!!!!!!!!!!!!!!!!!!!!");
}
{
ColorCMY cmy = ColorConversions.convertRGBtoCMY(rgb);
ColorCMYK cmyk = ColorConversions.convertCMYtoCMYK(cmy);
ColorCMY cmyk_cmy = ColorConversions.convertCMYKtoCMY(cmyk);
int cmyk_cmy_rgb = ColorConversions
.convertCMYtoRGB(cmyk_cmy);
Debug.debug("cmy", cmy);
Debug.debug("cmyk", cmyk);
Debug.debug("cmyk_cmy", cmyk_cmy);
Debug.debug("cmyk_cmy_rgb", cmyk_cmy_rgb + " ("
+ Integer.toHexString(cmyk_cmy_rgb) + ")");
if ((0xffffff & cmyk_cmy_rgb) != (0xffffff & rgb))
Debug.debug("!!!!!!!!!!!!!!!!!!!!!!!");
}
{
ColorHSL hsl = ColorConversions.convertRGBtoHSL(rgb);
int hsl_rgb = ColorConversions.convertHSLtoRGB(hsl);
Debug.debug("hsl", hsl);
Debug.debug("hsl_rgb", hsl_rgb + " ("
+ Integer.toHexString(hsl_rgb) + ")");
if ((0xffffff & hsl_rgb) != (0xffffff & rgb))
Debug.debug("!!!!!!!!!!!!!!!!!!!!!!!");
}
{
ColorHSV hsv = ColorConversions.convertRGBtoHSV(rgb);
int hsv_rgb = ColorConversions.convertHSVtoRGB(hsv);
Debug.debug("hsv", hsv);
Debug.debug("hsv_rgb", hsv_rgb + " ("
+ Integer.toHexString(hsv_rgb) + ")");
if ((0xffffff & hsv_rgb) != (0xffffff & rgb))
Debug.debug("!!!!!!!!!!!!!!!!!!!!!!!");
}
{
ColorCIELCH cielch = ColorConversions
.convertCIELabtoCIELCH(cielab);
ColorCIELab cielch_cielab = ColorConversions
.convertCIELCHtoCIELab(cielch);
Debug.debug("cielch", cielch);
Debug.debug("cielch_cielab", cielch_cielab);
}
{
ColorCIELuv cieluv = ColorConversions
.convertXYZtoCIELuv(xyz);
ColorXYZ cieluv_xyz = ColorConversions
.convertCIELuvtoXYZ(cieluv);
Debug.debug("cieluv", cieluv);
Debug.debug("cieluv_xyz", cieluv_xyz);
}
}
}
catch (Throwable e)
{
Debug.debug(e);
}
}
public static final ColorCIELab convertXYZtoCIELab(ColorXYZ xyz)
{
return convertXYZtoCIELab(xyz.X, xyz.Y, xyz.Z);
}
private static final double ref_X = 95.047;
private static final double ref_Y = 100.000;
private static final double ref_Z = 108.883;
public static final ColorCIELab convertXYZtoCIELab(double X, double Y,
double Z)
{
double var_X = X / ref_X; //ref_X = 95.047 Observer= 2, Illuminant= D65
double var_Y = Y / ref_Y; //ref_Y = 100.000
double var_Z = Z / ref_Z; //ref_Z = 108.883
if (var_X > 0.008856)
var_X = Math.pow(var_X, (1 / 3.0));
else
var_X = (7.787 * var_X) + (16 / 116.0);
if (var_Y > 0.008856)
var_Y = Math.pow(var_Y, 1 / 3.0);
else
var_Y = (7.787 * var_Y) + (16 / 116.0);
if (var_Z > 0.008856)
var_Z = Math.pow(var_Z, 1 / 3.0);
else
var_Z = (7.787 * var_Z) + (16 / 116.0);
double L = (116 * var_Y) - 16;
double a = 500 * (var_X - var_Y);
double b = 200 * (var_Y - var_Z);
return new ColorCIELab(L, a, b);
}
public static final ColorXYZ convertCIELabtoXYZ(ColorCIELab cielab)
{
return convertCIELabtoXYZ(cielab.L, cielab.a, cielab.b);
}
public static final ColorXYZ convertCIELabtoXYZ(double L, double a, double b)
{
double var_Y = (L + 16) / 116.0;
double var_X = a / 500 + var_Y;
double var_Z = var_Y - b / 200.0;
if (Math.pow(var_Y, 3) > 0.008856)
var_Y = Math.pow(var_Y, 3);
else
var_Y = (var_Y - 16 / 116.0) / 7.787;
if (Math.pow(var_X, 3) > 0.008856)
var_X = Math.pow(var_X, 3);
else
var_X = (var_X - 16 / 116.0) / 7.787;
if (Math.pow(var_Z, 3) > 0.008856)
var_Z = Math.pow(var_Z, 3);
else
var_Z = (var_Z - 16 / 116.0) / 7.787;
double X = ref_X * var_X; //ref_X = 95.047 Observer= 2, Illuminant= D65
double Y = ref_Y * var_Y; //ref_Y = 100.000
double Z = ref_Z * var_Z; //ref_Z = 108.883
return new ColorXYZ(X, Y, Z);
}
public static final ColorHunterLab convertXYZtoHunterLab(ColorXYZ xyz)
{
return convertXYZtoHunterLab(xyz.X, xyz.Y, xyz.Z);
}
public static final ColorHunterLab convertXYZtoHunterLab(double X,
double Y, double Z)
{
double L = 10 * Math.sqrt(Y);
double a = 17.5 * (((1.02 * X) - Y) / Math.sqrt(Y));
double b = 7 * ((Y - (0.847 * Z)) / Math.sqrt(Y));
return new ColorHunterLab(L, a, b);
}
public static final ColorXYZ convertHunterLabtoXYZ(ColorHunterLab cielab)
{
return convertHunterLabtoXYZ(cielab.L, cielab.a, cielab.b);
}
public static final ColorXYZ convertHunterLabtoXYZ(double L, double a,
double b)
{
double var_Y = L / 10;
double var_X = a / 17.5 * L / 10;
double var_Z = b / 7 * L / 10;
double Y = Math.pow(var_Y, 2);
double X = (var_X + Y) / 1.02;
double Z = -(var_Z - Y) / 0.847;
return new ColorXYZ(X, Y, Z);
}
public static final int convertXYZtoRGB(ColorXYZ xyz)
{
return convertXYZtoRGB(xyz.X, xyz.Y, xyz.Z);
}
public static final int convertXYZtoRGB(double X, double Y, double Z)
{
//Observer = 2�, Illuminant = D65
double var_X = X / 100.0; //Where X = 0 95.047
double var_Y = Y / 100.0; //Where Y = 0 100.000
double var_Z = Z / 100.0; //Where Z = 0 108.883
double var_R = var_X * 3.2406 + var_Y * -1.5372 + var_Z * -0.4986;
double var_G = var_X * -0.9689 + var_Y * 1.8758 + var_Z * 0.0415;
double var_B = var_X * 0.0557 + var_Y * -0.2040 + var_Z * 1.0570;
if (var_R > 0.0031308)
var_R = 1.055 * Math.pow(var_R, (1 / 2.4)) - 0.055;
else
var_R = 12.92 * var_R;
if (var_G > 0.0031308)
var_G = 1.055 * Math.pow(var_G, (1 / 2.4)) - 0.055;
else
var_G = 12.92 * var_G;
if (var_B > 0.0031308)
var_B = 1.055 * Math.pow(var_B, (1 / 2.4)) - 0.055;
else
var_B = 12.92 * var_B;
double R = (var_R * 255);
double G = (var_G * 255);
double B = (var_B * 255);
return convertRGBtoRGB(R, G, B);
}
public static final ColorXYZ convertRGBtoXYZ(int rgb)
{
int r = 0xff & (rgb >> 16);
int g = 0xff & (rgb >> 8);
int b = 0xff & (rgb >> 0);
double var_R = r / 255.0; //Where R = 0 - 255
double var_G = g / 255.0; //Where G = 0 - 255
double var_B = b / 255.0; //Where B = 0 - 255
if (var_R > 0.04045)
var_R = Math.pow((var_R + 0.055) / 1.055, 2.4);
else
var_R = var_R / 12.92;
if (var_G > 0.04045)
var_G = Math.pow((var_G + 0.055) / 1.055, 2.4);
else
var_G = var_G / 12.92;
if (var_B > 0.04045)
var_B = Math.pow((var_B + 0.055) / 1.055, 2.4);
else
var_B = var_B / 12.92;
var_R = var_R * 100;
var_G = var_G * 100;
var_B = var_B * 100;
// Observer. = 2, Illuminant = D65
double X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805;
double Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722;
double Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505;
return new ColorXYZ(X, Y, Z);
}
public static final ColorCMY convertRGBtoCMY(int rgb)
{
int R = 0xff & (rgb >> 16);
int G = 0xff & (rgb >> 8);
int B = 0xff & (rgb >> 0);
// RGB values = 0 - 255
// CMY values = 0 - 1
double C = 1 - (R / 255.0);
double M = 1 - (G / 255.0);
double Y = 1 - (B / 255.0);
return new ColorCMY(C, M, Y);
}
public static final int convertCMYtoRGB(ColorCMY cmy)
{
// CMY values = 0 - 1
// RGB values = 0 - 255
double R = (1 - cmy.C) * 255.0;
double G = (1 - cmy.M) * 255.0;
double B = (1 - cmy.Y) * 255.0;
return convertRGBtoRGB(R, G, B);
}
public static final ColorCMYK convertCMYtoCMYK(ColorCMY cmy)
{
// Where CMYK and CMY values = 0 - 1
double C = cmy.C;
double M = cmy.M;
double Y = cmy.Y;
double var_K = 1.0;
if (C < var_K)
var_K = C;
if (M < var_K)
var_K = M;
if (Y < var_K)
var_K = Y;
if (var_K == 1)
{ //Black
C = 0;
M = 0;
Y = 0;
}
else
{
C = (C - var_K) / (1 - var_K);
M = (M - var_K) / (1 - var_K);
Y = (Y - var_K) / (1 - var_K);
}
return new ColorCMYK(C, M, Y, var_K);
}
public static final ColorCMY convertCMYKtoCMY(ColorCMYK cmyk)
{
return convertCMYKtoCMY(cmyk.C, cmyk.M, cmyk.Y, cmyk.K);
}
public static final ColorCMY convertCMYKtoCMY(double C, double M, double Y,
double K)
{
// Where CMYK and CMY values = 0 - 1
C = (C * (1 - K) + K);
M = (M * (1 - K) + K);
Y = (Y * (1 - K) + K);
return new ColorCMY(C, M, Y);
}
public static final int convertCMYKtoRGB(int c, int m, int y, int k)
// throws ImageReadException, IOException
{
double C = c / 255.0;
double M = m / 255.0;
double Y = y / 255.0;
double K = k / 255.0;
return convertCMYtoRGB(convertCMYKtoCMY(C, M, Y, K));
}
public static final ColorHSL convertRGBtoHSL(int rgb)
{
int R = 0xff & (rgb >> 16);
int G = 0xff & (rgb >> 8);
int B = 0xff & (rgb >> 0);
double var_R = (R / 255.0); //Where RGB values = 0 - 255
double var_G = (G / 255.0);
double var_B = (B / 255.0);
double var_Min = Math.min(var_R, Math.min(var_G, var_B)); //Min. value of RGB
double var_Max = Math.max(var_R, Math.max(var_G, var_B)); //Max. value of RGB
double del_Max = var_Max - var_Min; //Delta RGB value
double L = (var_Max + var_Min) / 2.0;
double H, S;
// Debug.debug("del_Max", del_Max);
if (del_Max == 0) //This is a gray, no chroma...
{
H = 0; //HSL results = 0 - 1
S = 0;
}
else
//Chromatic data...
{
// Debug.debug("L", L);
if (L < 0.5)
S = del_Max / (var_Max + var_Min);
else
S = del_Max / (2 - var_Max - var_Min);
// Debug.debug("S", S);
double del_R = (((var_Max - var_R) / 6) + (del_Max / 2)) / del_Max;
double del_G = (((var_Max - var_G) / 6) + (del_Max / 2)) / del_Max;
double del_B = (((var_Max - var_B) / 6) + (del_Max / 2)) / del_Max;
if (var_R == var_Max)
H = del_B - del_G;
else if (var_G == var_Max)
H = (1 / 3.0) + del_R - del_B;
else if (var_B == var_Max)
H = (2 / 3.0) + del_G - del_R;
else
{
Debug.debug("uh oh");
H = 0; // cmc
}
// Debug.debug("H1", H);
if (H < 0)
H += 1;
if (H > 1)
H -= 1;
// Debug.debug("H2", H);
}
return new ColorHSL(H, S, L);
}
public static int convertHSLtoRGB(ColorHSL hsl)
{
return convertHSLtoRGB(hsl.H, hsl.S, hsl.L);
}
public static int convertHSLtoRGB(double H, double S, double L)
{
double R, G, B;
if (S == 0) //HSL values = 0 - 1
{
R = L * 255; //RGB results = 0 - 255
G = L * 255;
B = L * 255;
}
else
{
double var_2;
if (L < 0.5)
var_2 = L * (1 + S);
else
var_2 = (L + S) - (S * L);
double var_1 = 2 * L - var_2;
R = 255 * convertHuetoRGB(var_1, var_2, H + (1 / 3.0));
G = 255 * convertHuetoRGB(var_1, var_2, H);
B = 255 * convertHuetoRGB(var_1, var_2, H - (1 / 3.0));
}
return convertRGBtoRGB(R, G, B);
}
private static double convertHuetoRGB(double v1, double v2, double vH) //Function Hue_2_RGB
{
if (vH < 0)
vH += 1;
if (vH > 1)
vH -= 1;
if ((6 * vH) < 1)
return (v1 + (v2 - v1) * 6 * vH);
if ((2 * vH) < 1)
return (v2);
if ((3 * vH) < 2)
return (v1 + (v2 - v1) * ((2 / 3.0) - vH) * 6);
return (v1);
}
public static final ColorHSV convertRGBtoHSV(int rgb)
{
int R = 0xff & (rgb >> 16);
int G = 0xff & (rgb >> 8);
int B = 0xff & (rgb >> 0);
double var_R = (R / 255.0); //RGB values = 0 - 255
double var_G = (G / 255.0);
double var_B = (B / 255.0);
double var_Min = Math.min(var_R, Math.min(var_G, var_B)); //Min. value of RGB
double var_Max = Math.max(var_R, Math.max(var_G, var_B)); //Max. value of RGB
double del_Max = var_Max - var_Min; //Delta RGB value
double V = var_Max;
double H, S;
if (del_Max == 0) //This is a gray, no chroma...
{
H = 0; //HSV results = 0 - 1
S = 0;
}
else
//Chromatic data...
{
S = del_Max / var_Max;
double del_R = (((var_Max - var_R) / 6) + (del_Max / 2)) / del_Max;
double del_G = (((var_Max - var_G) / 6) + (del_Max / 2)) / del_Max;
double del_B = (((var_Max - var_B) / 6) + (del_Max / 2)) / del_Max;
if (var_R == var_Max)
H = del_B - del_G;
else if (var_G == var_Max)
H = (1 / 3.0) + del_R - del_B;
else if (var_B == var_Max)
H = (2 / 3.0) + del_G - del_R;
else
{
Debug.debug("uh oh");
H = 0; // cmc;
}
if (H < 0)
H += 1;
if (H > 1)
H -= 1;
}
return new ColorHSV(H, S, V);
}
public static int convertHSVtoRGB(ColorHSV HSV)
{
return convertHSVtoRGB(HSV.H, HSV.S, HSV.V);
}
public static int convertHSVtoRGB(double H, double S, double V)
{
double R, G, B;
if (S == 0) //HSV values = 0 - 1
{
R = V * 255;
G = V * 255;
B = V * 255;
}
else
{
double var_h = H * 6;
if (var_h == 6)
var_h = 0; //H must be < 1
double var_i = Math.floor(var_h); //Or ... var_i = floor( var_h )
double var_1 = V * (1 - S);
double var_2 = V * (1 - S * (var_h - var_i));
double var_3 = V * (1 - S * (1 - (var_h - var_i)));
double var_r, var_g, var_b;
if (var_i == 0)
{
var_r = V;
var_g = var_3;
var_b = var_1;
}
else if (var_i == 1)
{
var_r = var_2;
var_g = V;
var_b = var_1;
}
else if (var_i == 2)
{
var_r = var_1;
var_g = V;
var_b = var_3;
}
else if (var_i == 3)
{
var_r = var_1;
var_g = var_2;
var_b = V;
}
else if (var_i == 4)
{
var_r = var_3;
var_g = var_1;
var_b = V;
}
else
{
var_r = V;
var_g = var_1;
var_b = var_2;
}
R = var_r * 255; //RGB results = 0 - 255
G = var_g * 255;
B = var_b * 255;
}
return convertRGBtoRGB(R, G, B);
}
public static final int convertCMYKtoRGB_old(int sc, int sm, int sy, int sk)
// throws ImageReadException, IOException
{
int red = 255 - (sc + sk);
int green = 255 - (sm + sk);
int blue = 255 - (sy + sk);
return convertRGBtoRGB(red, green, blue);
}
private static double cube(double f)
{
return f * f * f;
}
private static double square(double f)
{
return f * f;
}
public static final int convertCIELabtoARGBTest(int cieL, int cieA, int cieB)
{
double X, Y, Z;
{
double var_Y = ((cieL * 100.0 / 255.0) + 16.0) / 116.0;
double var_X = cieA / 500.0 + var_Y;
double var_Z = var_Y - cieB / 200.0;
double var_x_cube = cube(var_X);
double var_y_cube = cube(var_Y);
double var_z_cube = cube(var_Z);
if (var_y_cube > 0.008856)
var_Y = var_y_cube;
else
var_Y = (var_Y - 16 / 116.0) / 7.787;
if (var_x_cube > 0.008856)
var_X = var_x_cube;
else
var_X = (var_X - 16 / 116.0) / 7.787;
if (var_z_cube > 0.008856)
var_Z = var_z_cube;
else
var_Z = (var_Z - 16 / 116.0) / 7.787;
// double ref_X = 95.047;
// double ref_Y = 100.000;
// double ref_Z = 108.883;
X = ref_X * var_X; //ref_X = 95.047 Observer= 2, Illuminant= D65
Y = ref_Y * var_Y; //ref_Y = 100.000
Z = ref_Z * var_Z; //ref_Z = 108.883
}
double R, G, B;
{
double var_X = X / 100; //X = From 0 to ref_X
double var_Y = Y / 100; //Y = From 0 to ref_Y
double var_Z = Z / 100; //Z = From 0 to ref_Y
double var_R = var_X * 3.2406 + var_Y * -1.5372 + var_Z * -0.4986;
double var_G = var_X * -0.9689 + var_Y * 1.8758 + var_Z * 0.0415;
double var_B = var_X * 0.0557 + var_Y * -0.2040 + var_Z * 1.0570;
if (var_R > 0.0031308)
var_R = 1.055 * Math.pow(var_R, (1 / 2.4)) - 0.055;
else
var_R = 12.92 * var_R;
if (var_G > 0.0031308)
var_G = 1.055 * Math.pow(var_G, (1 / 2.4)) - 0.055;
else
var_G = 12.92 * var_G;
if (var_B > 0.0031308)
var_B = 1.055 * Math.pow(var_B, (1 / 2.4)) - 0.055;
else
var_B = 12.92 * var_B;
R = (var_R * 255);
G = (var_G * 255);
B = (var_B * 255);
}
return convertRGBtoRGB(R, G, B);
}
private static final int convertRGBtoRGB(double R, double G, double B)
{
int red = (int) Math.round(R);
int green = (int) Math.round(G);
int blue = (int) Math.round(B);
red = Math.min(255, Math.max(0, red));
green = Math.min(255, Math.max(0, green));
blue = Math.min(255, Math.max(0, blue));
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
return rgb;
}
private static final int convertRGBtoRGB(int red, int green, int blue)
{
red = Math.min(255, Math.max(0, red));
green = Math.min(255, Math.max(0, green));
blue = Math.min(255, Math.max(0, blue));
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
return rgb;
}
public static ColorCIELCH convertCIELabtoCIELCH(ColorCIELab cielab)
{
return convertCIELabtoCIELCH(cielab.L, cielab.a, cielab.b);
}
public static ColorCIELCH convertCIELabtoCIELCH(double L, double a, double b)
{
double var_H = Math.atan2(b, a); //Quadrant by signs
if (var_H > 0)
var_H = (var_H / Math.PI) * 180.0;
else
var_H = 360 - radian_2_degree(Math.abs(var_H));
// L = L;
double C = Math.sqrt(square(a) + square(b));
double H = var_H;
return new ColorCIELCH(L, C, H);
}
public static ColorCIELab convertCIELCHtoCIELab(ColorCIELCH cielch)
{
return convertCIELCHtoCIELab(cielch.L, cielch.C, cielch.H);
}
public static ColorCIELab convertCIELCHtoCIELab(double L, double C, double H)
{
// Where CIE-H = 0 - 360
// CIE-L* = CIE-L;
double a = Math.cos(degree_2_radian(H)) * C;
double b = Math.sin(degree_2_radian(H)) * C;
return new ColorCIELab(L, a, b);
}
public static double degree_2_radian(double degree)
{
return degree * Math.PI / 180.0;
}
public static double radian_2_degree(double radian)
{
return radian * 180.0 / Math.PI;
}
public static ColorCIELuv convertXYZtoCIELuv(ColorXYZ xyz)
{
return convertXYZtoCIELuv(xyz.X, xyz.Y, xyz.Z);
}
public static ColorCIELuv convertXYZtoCIELuv(double X, double Y, double Z)
{
// problems here with div by zero
double var_U = (4 * X) / (X + (15 * Y) + (3 * Z));
double var_V = (9 * Y) / (X + (15 * Y) + (3 * Z));
// Debug.debug("var_U", var_U);
// Debug.debug("var_V", var_V);
double var_Y = Y / 100.0;
// Debug.debug("var_Y", var_Y);
if (var_Y > 0.008856)
var_Y = Math.pow(var_Y, (1 / 3.0));
else
var_Y = (7.787 * var_Y) + (16 / 116.0);
double ref_X = 95.047; //Observer= 2, Illuminant= D65
double ref_Y = 100.000;
double ref_Z = 108.883;
// Debug.debug("var_Y", var_Y);
double ref_U = (4 * ref_X) / (ref_X + (15 * ref_Y) + (3 * ref_Z));
double ref_V = (9 * ref_Y) / (ref_X + (15 * ref_Y) + (3 * ref_Z));
// Debug.debug("ref_U", ref_U);
// Debug.debug("ref_V", ref_V);
double L = (116 * var_Y) - 16;
double u = 13 * L * (var_U - ref_U);
double v = 13 * L * (var_V - ref_V);
return new ColorCIELuv(L, u, v);
}
public static ColorXYZ convertCIELuvtoXYZ(ColorCIELuv cielch)
{
return convertCIELuvtoXYZ(cielch.L, cielch.u, cielch.v);
}
public static ColorXYZ convertCIELuvtoXYZ(double L, double u, double v)
{
// problems here with div by zero
double var_Y = (L + 16) / 116;
if (Math.pow(var_Y, 3) > 0.008856)
var_Y = Math.pow(var_Y, 3);
else
var_Y = (var_Y - 16 / 116) / 7.787;
double ref_X = 95.047; //Observer= 2, Illuminant= D65
double ref_Y = 100.000;
double ref_Z = 108.883;
double ref_U = (4 * ref_X) / (ref_X + (15 * ref_Y) + (3 * ref_Z));
double ref_V = (9 * ref_Y) / (ref_X + (15 * ref_Y) + (3 * ref_Z));
double var_U = u / (13 * L) + ref_U;
double var_V = v / (13 * L) + ref_V;
double Y = var_Y * 100;
double X = -(9 * Y * var_U) / ((var_U - 4) * var_V - var_U * var_V);
double Z = (9 * Y - (15 * var_V * Y) - (var_V * X)) / (3 * var_V);
return new ColorXYZ(X, Y, Z);
}
}