Java RGB Color Convert To RGBtoHSL(int r, int g, int b)

Description

RG Bto HSL

License

Open Source License

Declaration

private static float[] RGBtoHSL(int r, int g, int b) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2001-2006 Mathew A. Nelson and Robocode contributors
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.robocode.net/license/CPLv1.0.html
 * /*from   ww w .ja va 2 s .  c om*/
 * Contributors:
 *     Flemming N. Larsen
 *     - Initial implementation
 *******************************************************************************/

public class Main {
    private static float[] RGBtoHSL(int r, int g, int b) {
        float R = (float) r / 255;
        float G = (float) g / 255;
        float B = (float) b / 255;

        float min = Math.min(Math.min(R, G), B); // Min. value of RGB
        float max = Math.max(Math.max(R, G), B); // Max. value of RGB
        float delta = max - min; // Delta RGB value

        float L = (max + min) / 2;

        float H, S;

        if (delta == 0) { // This is a gray, no chroma...
            H = 0;
            S = 0;
        } else { // Chromatic data...
            if (L < 0.5f) {
                S = delta / (max + min);
            } else {
                S = delta / (2 - max - min);
            }

            float deltaR = (((max - R) / 6) + (delta / 2)) / delta;
            float deltaG = (((max - G) / 6) + (delta / 2)) / delta;
            float deltaB = (((max - B) / 6) + (delta / 2)) / delta;

            if (R == max) {
                H = deltaB - deltaG;
            } else if (G == max) {
                H = (1f / 3) + deltaR - deltaB;
            } else {
                H = (2f / 3) + deltaG - deltaR;
            }

            if (H < 0) {
                H++;
            }
            if (H > 1) {
                H--;
            }
        }
        return new float[] { H, S, L };
    }
}

Related

1. RGBtoHSB(int r, int g, int b, float[] hsbvals)
2. RGBtoHSB(int red, int green, int blue, float hsb[])
3. rgbToHsl(byte red, byte green, byte blue)
4. RgbToHsl(float r, float g, float b, float a)
5. rgbToHsl(float[] rgb)
6. RGBtoHSL(int r, int g, int b)
7. RGBtoHSL(int r, int g, int b, float[] hsl)
8. rgbToHsl(int red, int green, int blue)
9. rgbToHsv(byte[] rgb, float[] hsv)