What's the best way to “round” a Color object to the nearest Color Constant?

Question

I will be retrieving the exact color of a pixel and would like to relate that exact color to a constant like Color.blue. Is there an easy way to \"round\" to the n

Answer 1

You can use Java's built-in color conversion with an IndexColorModel containing the palette of possible colors. Internally, the class uses Euclidean distance over the color components to determine the closest color.

import java.awt.Color;
import java.awt.image.DataBuffer;
import java.awt.image.IndexColorModel;

public class ColorConverter {
    private final Color[] colors;
    private final IndexColorModel colorModel;

    public ColorConverter(Color[] colors) {
        this.colors = colors;
        this.colorModel = createColorModel(colors);
    }

    private static IndexColorModel createColorModel(Color[] colors) {
        final int[] cmap = new int[colors.length];
        for (int i = 0; i