Converts an RGB color value to HSL. - Java 2D Graphics

Java examples for 2D Graphics:Color RGB

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Description

Converts an RGB color value to HSL.

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        float[] rgb = new float[] { 34.45f, 35.45f, 36.67f, 37.78f,
                37.0000f, 37.1234f, 67.2344f, 68.34534f, 69.87700f };
        System.out.println(java.util.Arrays.toString(rgbToHsl(rgb)));
    }//from  ww w .j  a va2 s . c  om

    /**
     * Converts an RGB color value to HSL. Conversion formula
     * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
     * Assumes r, g, and b are contained in the set [0, 255] and
     * returns h, s, and l in the set [0, 1].
     *
     * @param   Number  r       The red color value
     * @param   Number  g       The green color value
     * @param   Number  b       The blue color value
     * @return  Array           The HSL representation
     */
    public static float[] rgbToHsl(float[] rgb) {
        float r, g, b;
        r = rgb[0];
        g = rgb[1];
        b = rgb[2];
        float max = Math.max(r, Math.max(g, b));
        float min = Math.min(r, Math.min(g, b));
        float avg = (max + min) / 2;
        float h = avg, s = avg, l = avg;

        if (max == min) {
            h = s = 0; // achromatic
        } else {
            float d = max - min;
            s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
            if (max == r) {
                h = (g - b) / d + (g < b ? 6 : 0);
            } else if (max == g) {
                h = (b - r) / d + 2;
            } else if (max == b) {
                h = (r - g) / d + 4;
            }
            h /= 6;
        }

        return new float[] { h, s, l };
    }
}

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