Java HSV Color to HSB HSVtoRGB(double hue, double saturation, double value)

Description

Method returns three integers representing the RGB values of a HSV input Values in input must be between 0 and 1 Values in output are between 0 and 255.

License

Apache License

Parameter

Parameter	Description
hue	a parameter
saturation	a parameter
value	a parameter

Declaration

public static int[] HSVtoRGB(double hue, double saturation, double value) 

Method Source Code

//package com.java2s;
/*//from ww w . jav a2  s . com
 * Copyright 2007 Robert Hanson <iamroberthanson AT gmail.com>
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Method returns three integers representing the RGB values of a HSV input
     * Values in input must be between 0 and 1
     * Values in output are between 0 and 255.
     * 
     * See http://www.easyrgb.com/math.php?MATH=M21#text21 for details of algorithm used.
     * 
     * @param hue
     * @param saturation
     * @param value
     * @return
     */
    public static int[] HSVtoRGB(double hue, double saturation, double value) {
        int R, G, B;
        //String sR="ff",sG="ff",sB="ff";
        if (saturation == 0) //HSV values = 0 / 1
        {
            R = new Double(value * 255).intValue();
            G = new Double(value * 255).intValue();
            B = new Double(value * 255).intValue();
        } else {
            double var_h = hue * 6;
            if (var_h == 6)
                var_h = 0; //H must be < 1
            int var_i = new Double(Math.floor(var_h)).intValue(); //Or ... var_i = floor( var_h )
            double var_1 = value * (1 - saturation);
            double var_2 = value * (1 - saturation * (var_h - var_i));
            double var_3 = value * (1 - saturation * (1 - (var_h - var_i)));
            double var_r;
            double var_g;
            double var_b;
            if (var_i == 0) {
                var_r = value;
                var_g = var_3;
                var_b = var_1;
            } else if (var_i == 1) {
                var_r = var_2;
                var_g = value;
                var_b = var_1;
            } else if (var_i == 2) {
                var_r = var_1;
                var_g = value;
                var_b = var_3;
            } else if (var_i == 3) {
                var_r = var_1;
                var_g = var_2;
                var_b = value;
            } else if (var_i == 4) {
                var_r = var_3;
                var_g = var_1;
                var_b = value;
            } else {
                var_r = value;
                var_g = var_1;
                var_b = var_2;
            }
            R = new Double(var_r * 255).intValue(); //RGB results = 0 / 255
            G = new Double(var_g * 255).intValue();
            B = new Double(var_b * 255).intValue();
        }
        int[] returnArray = new int[3];
        returnArray[0] = R;
        returnArray[1] = G;
        returnArray[2] = B;
        return returnArray;
    }
}

Related

1. hsv2rgb(float h, float s, float v, float[] rgb)
2. hsv2rgb_hex(float h, float s, float v)
3. hsva(double hue, double saturation, double value, double alpha)
4. HSVToColor(float[] hsv)
5. hsvToRgb(double hue, double saturation, double value)
6. hsvToRgb(double[] hsv)
7. HSVtoRGB(float h, float s, float v)
8. HSVtoRGB(float h, float s, float v, float[] result)
9. hsvToRgb(float h, float s, float v, int[] rgb)