Java RGB Color Convert To RGBtoHSV(int red, int green, int blue)

Description

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

License

Apache License

Parameter

Parameter	Description
red	a parameter
green	a parameter
blue	a parameter

Declaration

public static double[] RGBtoHSV(int red, int green, int blue) 

Method Source Code

//package com.java2s;
/*/*www  .  j a  v a 2 s  .  c  o m*/
 * 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 doubles representing the HSV values of a RGB input
     * Values in input must be between 0 and 255
     * Values in output are between 0 and 1.
     * 
     * See http://www.easyrgb.com/math.php?MATH=M21#text21 for details of algorithm used.
     * 
     * @param red
     * @param green
     * @param blue
     * @return
     */
    public static double[] RGBtoHSV(int red, int green, int blue) {
        double H = 0, S = 0, V = 0;

        double R = red / 255.0;
        double G = green / 255.0;
        double B = blue / 255.0;

        double var_Min = Math.min(Math.min(R, G), B); //Min. value of RGB
        double var_Max = Math.max(Math.max(R, G), B); //Max. value of RGB
        double del_Max = var_Max - var_Min; //Delta RGB value

        V = var_Max;

        if (del_Max == 0) {
            // This is a gray, no chroma...
            H = 0; // HSV results = 0 / 1
            S = 0;
        } else {
            // Chromatic data...
            S = del_Max / var_Max;

            double del_R = (((var_Max - R) / 6) + (del_Max / 2)) / del_Max;
            double del_G = (((var_Max - G) / 6) + (del_Max / 2)) / del_Max;
            double del_B = (((var_Max - B) / 6) + (del_Max / 2)) / del_Max;

            if (R == var_Max) {
                H = del_B - del_G;
            } else if (G == var_Max) {
                H = (1 / 3) + del_R - del_B;
            } else if (B == var_Max) {
                H = (2 / 3) + del_G - del_R;
            }
            if (H < 0) {
                H += 1;
            }
            if (H > 1) {
                H -= 1;
            }
        }

        return new double[] { H, S, V };
    }
}

Related

1. RGBtoHSV(double r, double g, double b)
2. RGBtoHSV(float r, float g, float b, float[] result)
3. RGBToHSV(float... rgb)
4. RGBtoHSV(float[] hsv, float[] rgb)
5. RGBtoHSV(int r, int g, int b, double hsv[])
6. rgbToHsv(int red, int green, int blue)
7. RGBToHSV(int red, int green, int blue, float[] hsv)
8. rgbToHsv(int rgb)
9. RGBtoHTML(int rgb)