Java RGB Color Convert To RgbToHsl(float r, float g, float b, float a)

Description

Rgb To Hsl

License

Apache License

Declaration

static float[] RgbToHsl(float r, float g, float b, float a) 

Method Source Code

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

public class Main {
    static float[] RgbToHsl(float r, float g, float b, float a) {
        float h = 0, s = 0, l;

        float max = Math.max(r, Math.max(g, b));
        float min = Math.min(r, Math.min(g, b));

        // hue//from   www .j a va  2 s. co m
        if (max == min) {
            h = 0; // undefined
        } else if (max == r && g >= b) {
            h = 1.0f / 6.0f * (g - b) / (max - min);
        } else if (max == r && g < b) {
            h = 1.0f / 6.0f * (g - b) / (max - min) + 1.0f;
        } else if (max == g) {
            h = 1.0f / 6.0f * (b - r) / (max - min) + 1.0f / 3.0f;
        } else if (max == b) {
            h = 1.0f / 6.0f * (r - g) / (max - min) + 2.0f / 3.0f;
        }

        // luminance
        l = (max + min) / 2.0f;

        // saturation
        if (l == 0 || max == min) {
            s = 0;
        } else if (0 < l && l <= 0.5) {
            s = (max - min) / (max + min);
        } else if (l > 0.5) {
            s = (max - min) / (2 - (max + min)); //(max-min > 0)?
        }

        float[] result = new float[4];
        result[0] = h;
        result[1] = s;
        result[2] = l;
        result[3] = a;

        return result;
    }
}

Related

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