/
ColorUtil.java
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/
ColorUtil.java
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package mezz.jei.util.color;
import java.awt.Color;
public class ColorUtil {
private ColorUtil() {
}
/**
* http://www.compuphase.com/cmetric.htm
* http://stackoverflow.com/a/6334454
* Returns 0 for equal colors, nonzero for colors that look different.
* The return value is farther from 0 the more different the colors look.
*/
public static double fastPerceptualColorDistanceSquared(int[] color1, int[] color2) {
final int red1 = color1[0];
final int red2 = color2[0];
final int redMean = (red1 + red2) >> 1;
final int r = red1 - red2;
final int g = color1[1] - color2[1];
final int b = color1[2] - color2[2];
return (((512 + redMean) * r * r) >> 8) + 4 * g * g + (((767 - redMean) * b * b) >> 8);
}
/**
* http://www.compuphase.com/cmetric.htm
* http://stackoverflow.com/a/6334454
* Returns 0 for equal colors, nonzero for colors that look different.
* The return value is farther from 0 the more different the colors look.
* <p>
* Weighs the distance from grey more heavily, to avoid matching grey and colorful colors together.
*/
public static double slowPerceptualColorDistanceSquared(int[] color1, int[] color2) {
final double colorDistance = fastPerceptualColorDistanceSquared(color1, color2);
final double grey1 = (color1[0] + color1[1] + color1[2]) / 3;
final double grey2 = (color2[0] + color2[1] + color2[2]) / 3;
final double greyDistance1 = Math.abs(grey1 - color1[0]) + Math.abs(grey1 - color1[1]) + Math.abs(grey1 - color1[2]);
final double greyDistance2 = Math.abs(grey2 - color2[0]) + Math.abs(grey2 - color2[1]) + Math.abs(grey2 - color2[2]);
final double greyDistance = greyDistance1 - greyDistance2;
return colorDistance + (greyDistance * greyDistance / 10.0);
}
public static double slowPerceptualColorDistanceSquared(Color color1, Color color2) {
final int[] colorInts1 = {color1.getRed(), color1.getGreen(), color1.getBlue()};
final int[] colorInts2 = {color2.getRed(), color2.getGreen(), color2.getBlue()};
return slowPerceptualColorDistanceSquared(colorInts1, colorInts2);
}
}