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

Description

Converts RGB to HSL.

License

LGPL

Parameter

Parameter	Description
r	red value
g	green value
b	blue value

Return

Array containing HSL values in the format {h,s,l}

Declaration

public static double[] RGBtoHSL(int r, int g, int b) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

public class Main {
    /**//from www .  j ava 2  s .  com
     * Converts RGB to HSL.
     * HSL values are in decimal form: <br>
     * H: 360 = 1, <br>
     * S: 100 = 1, <br>
     * L: 100 = 1. <br>
     * Thanks to http://serennu.com/colour/rgbtohsl.php for help on this calculation.
     *
     * @param r red value
     * @param g green value
     * @param b blue value
     * @return Array containing HSL values in the format {h,s,l}
     */
    public static double[] RGBtoHSL(int r, int g, int b) {
        double h = 0;
        double s = 0;
        double l = 0;

        double varR = r / 255.0;
        double varG = g / 255.0;
        double varB = b / 255.0;

        double varMin = Math.min(varR, Math.min(varG, varB));
        double varMax = Math.max(varR, Math.max(varG, varB));
        double delMax = varMax - varMin;

        l = (varMin + varMax) / 2;
        if (delMax == 0) {
            h = 0;
            s = 0;
        } else {
            if (l < 0.5) {
                s = delMax / (varMax + varMin);
            } else {
                s = delMax / (2 - varMax - varMin);
            }

            double delR = (((varMax - varR) / 6.0) + (delMax / 2.0)) / delMax;
            double delG = (((varMax - varG) / 6.0) + (delMax / 2.0)) / delMax;
            double delB = (((varMax - varB) / 6.0) + (delMax / 2.0)) / delMax;

            if (varR == varMax) {
                h = delB - delG;
            } else if (varG == varMax) {
                h = (1.0 / 3.0) + delR + delB;
            } else if (varB == varMax) {
                h = (2.0 / 3.0) + delG - delR;
            }

            if (h < 0) {
                h += 1;
            }

            if (h > 1) {
                h -= 1;
            }
        }

        double[] hsl = new double[3];
        hsl[0] = h;
        hsl[1] = s;
        hsl[2] = l;
        return hsl;
    }
}

Related

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