Color To Hsv - CSharp System.Drawing

CSharp examples for System.Drawing:Color HSV

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Description

Color To Hsv

Demo Code


using System.Drawing.Imaging;
using System.Drawing;
using System.Text;
using System.Collections.Generic;
using System;//w  w  w . jav  a 2s.c o  m

public class Main{
        static public void ToHsv(Color color, out int Hue, out int Saturation, out int Value)
        {
            // In this function, R, G, and B values must be scaled 
            // to be between 0 and 1.
            // HsvColor.Hue will be a value between 0 and 360, and 
            // HsvColor.Saturation and value are between 0 and 1.

            double min;
            double max;
            double delta;

            double r = (double)color.R / 255;
            double g = (double)color.G / 255;
            double b = (double)color.B / 255;

            double h;
            double s;
            double v;

            min = Math.Min(Math.Min(r, g), b);
            max = Math.Max(Math.Max(r, g), b);
            v = max;
            delta = max - min;

            if (max == 0 || delta == 0)
            {
                // R, G, and B must be 0, or all the same.
                // In this case, S is 0, and H is undefined.
                // Using H = 0 is as good as any...
                s = 0;
                h = 0;
            }
            else
            {
                s = delta / max;
                if (r == max)
                {
                    // Between Yellow and Magenta
                    h = (g - b) / delta;
                }
                else if (g == max)
                {
                    // Between Cyan and Yellow
                    h = 2 + (b - r) / delta;
                }
                else
                {
                    // Between Magenta and Cyan
                    h = 4 + (r - g) / delta;
                }

            }
            // Scale h to be between 0 and 360. 
            // This may require adding 360, if the value
            // is negative.
            h *= 60;

            if (h < 0)
            {
                h += 360;
            }

            // Scale to the requirements of this 
            // application. All values are between 0 and 255.
            Hue = (int)h;
            Saturation = (int)(s * 100);
            Value = (int)(v * 100);
        }
}

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