Converts an RGB array to an HSV array - Java 2D Graphics

Java examples for 2D Graphics:Color RGB

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Description

Converts an RGB array to an HSV array

Demo Code

/**/*  w  w w.ja v  a  2s  . c o m*/
 * CamanJ - Java Image Manipulation
 * Ported from the CamanJS Javascript library
 *
 * Copyright 2011, Ryan LeFevre
 * Licensed under the new BSD License
 * See LICENSE for more info.
 * 
 * Project Home: http://github.com/meltingice/CamanJ
 */

public class Main{
    public static void main(String[] argv) throws Exception{
        int[] rgb = new int[]{34,35,36,37,37,37,67,68,69};
        System.out.println(java.util.Arrays.toString(rgbToHsv(rgb)));
    }
    /**
     * Converts an RGB array to an HSV array
     * 
     * @param rgb
     *            The RGB values to convert
     * @return An array of double values representing the equivalent HSV value
     */
    public static double[] rgbToHsv(int[] rgb) {
        double[] drgb = CamanUtil.toDouble(rgb);

        drgb[0] /= 255;
        drgb[1] /= 255;
        drgb[2] /= 255;

        double max = Math.max(Math.max(drgb[0], drgb[1]), drgb[2]);
        double min = Math.min(Math.min(drgb[0], drgb[1]), drgb[2]);
        double h = max, s = max, v = max;
        double d = max - min;

        s = (max == 0 ? 0 : d / max);

        if (max == min) {
            // Monochrome
            h = 0;
        } else {
            if (max == rgb[0]) {
                h = (rgb[1] - rgb[2]) / d + (rgb[1] < rgb[2] ? 6 : 0);
            } else if (max == rgb[1]) {
                h = (rgb[2] - rgb[0]) / d + 2;
            } else if (max == rgb[2]) {
                h = (rgb[0] - rgb[1]) / d + 4;
            }

            h /= 6;
        }

        return new double[] { h, s, v };
    }
}

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