Thread: Hue index Histogram

Hai, I'm student in some college in indonesia

I have some problem to make hue index histogram from RGB Image .Because i'm newbie in C#.

I have problem to make code to convert from RGB to HSV color.

Anyone can help me to make hue index histogram from RGB image ???

Please !!!!

I couldn't find any C# functions which convert RGB to HSV, however there are lots of javascript examples on google. Here's one which I've converted to C# for you. I've not tested much but it should work.

Code:

using System;
using System.Collections.Generic;
using System.Text;

namespace whatever
{
    class Program
    {
        static void Main()
        {
            // test it

            HSVObject test = RGB2HSV(240, 123, 212);
            Console.WriteLine("{0} {1} {2}", test.H, test.S, test.V);
            Console.Read();
        }

        static HSVObject RGB2HSV(int red, int green, int blue)
        {
            decimal H, S, V;

            decimal r = (decimal)(red / 255.0);
            decimal g = (decimal)(green / 255.0);
            decimal b = (decimal)(blue / 255.0);
            decimal min = Math.Min(Math.Min(r, g), b);
            decimal max = Math.Max(Math.Max(r, g), b);
            decimal delta = max - min;

            V = max;

            if (delta == 0)
            {
                H = 0;
                S = 0;
            }
            else
            {
                S = delta / max;

                decimal dR = ((((max - r) / 6) + (delta / 2)) / delta);
                decimal dG = ((((max - g) / 6) + (delta / 2)) / delta);
                decimal dB = ((((max - b) / 6) + (delta / 2)) / delta);

                if (r == max)
                    H = dB - dG;
                else if (g == max)
                    H = (1 / 3) + dR - dB;
                else
                    H = (2 / 3) + dG - dR;

                if (H < 0)
                    H += 1;

                if (H > 1)
                    H -= 1;
            }

            return new HSVObject(H, S, V);
        }
    }

    class HSVObject
    {
        public int H;
        public int S;
        public int V;

        public HSVObject(decimal H, decimal S, decimal V)
        {
            this.H = (int)Math.Round(H * 360);
            this.S = (int)Math.Round(S * 100);
            this.V = (int)Math.Round(V * 100);
        }
    }
}

Thank For your Reply

I will try it