Java by API/java.awt.image/IndexColorModel

new IndexColorModel(int bits, int size, byte[] r, byte[] g, byte[] b)

   <source lang="java">

import java.awt.Color; import java.awt.image.ColorModel; import java.awt.image.IndexColorModel; public class MainClass {

 public static void main(String[] args) throws Exception {
   byte ff = (byte) 0xff;
   byte[] r = { ff, 0, 0, ff, 0 };
   byte[] g = { 0, ff, 0, ff, 0 };
   byte[] b = { 0, 0, ff, ff, 0 };
   ColorModel cm = new IndexColorModel(3, 5, r, g, b);
   Color[] colors = { new Color(255, 0, 0), new Color(0, 255, 0), new Color(0, 0, 255)};
   for (int i = 0; i < colors.length; i++) {
     int rgb = colors[i].getRGB();
     Object pixel = cm.getDataElements(rgb, null);
     System.out.println(colors[i] + " -> " + ((byte[]) pixel)[0]);
   }
   for (byte i = 0; i < 5; i++) {
     int[] unnormalizedComponents = cm.getComponents(i, null, 0);
     System.out.print(i + " -> unnormalized components");
     for (int j = 0; j < unnormalizedComponents.length; j++)
       System.out.print(" " + unnormalizedComponents[j]);
     System.out.println();
   }
 }

}

      </source>