Rgb和Hsv相互转换的方法！

　　以下是我在进行Rgb和Hsv色彩模式相互转换的方法，经过两个软件使用和测试！挖坑笔记！

　　

using System;
using System.Drawing;

namespace EngTyping.Class
{
    /**//// <summary>
    /// ColorHandle 处理Rgb|Hsv的相互转换
    /// </summary>
    internal class ColorHandle
    {
        public int H,S,V;
        public int R,G,B;
        public int C,M,Y,K;
        /**//// <summary>
        /// 处理Rgb到Hsv的转换
        /// </summary>
        /// <param name="R"></param>
        /// <param name="G"></param>
        /// <param name="B"></param>
        /// 
        public void RgbToHsv(int R,int G,int B)
        {
            Color MyColor=Color.FromArgb(R,G,B);
            H=Convert.ToInt32(MyColor.GetHue());

            //奇怪——用微软自己的方法获得的S值和V值居然不对
            //S=Convert.ToInt32(MyColor.GetSaturation()/255*100);
            //V=Convert.ToInt32(MyColor.GetBrightness()/255*100);

            decimal min;
            decimal max;
            decimal delta;

            decimal R1=Convert.ToDecimal(R)/255;
            decimal G1=Convert.ToDecimal(G)/255;
            decimal B1=Convert.ToDecimal(B)/255;

            min = Math.Min(Math.Min(R1, G1), B1);
            max = Math.Max(Math.Max(R1, G1), B1);
            V = Convert.ToInt32(max*100);
            delta = (max - min)*100;

            if (max == 0 || delta == 0)
                S = 0;
            else
                S = Convert.ToInt32(delta / max);
            
        }


        public void RgbToHsv(Color MyColor)
        {
            //Color MyColor=Color.FromArgb(R,G,B);
            int R = MyColor.R;
            int G = MyColor.G;
            int B = MyColor.B;
            H=Convert.ToInt32(MyColor.GetHue());

            //奇怪——用微软自己的方法获得的S值和V值居然不对
            //S=Convert.ToInt32(MyColor.GetSaturation()/255*100);
            //V=Convert.ToInt32(MyColor.GetBrightness()/255*100);

            decimal min;
            decimal max;
            decimal delta;

            decimal R1=Convert.ToDecimal(R)/255;
            decimal G1=Convert.ToDecimal(G)/255;
            decimal B1=Convert.ToDecimal(B)/255;

            min = Math.Min(Math.Min(R1, G1), B1);
            max = Math.Max(Math.Max(R1, G1), B1);
            V = Convert.ToInt32(max*100);
            delta = (max - min)*100;

            if (max == 0 || delta == 0)
                S = 0;
            else
                S = Convert.ToInt32(delta / max);
            
        }

        /**//// <summary>
        /// 处理Hsv到Rgb的转换
        /// </summary>
        /// <param name="H"></param>
        /// <param name="S"></param>
        /// <param name="V"></param>
        public void HsvToRgb(int H,int S,int V)
        {

            H=Convert.ToInt32(Convert.ToDecimal( H )/360*255);
            S=Convert.ToInt32(Convert.ToDecimal( S )/100*255);
            V=Convert.ToInt32(Convert.ToDecimal( V )/100*255);

            if (S==0)
            {
                R=0;
                G=0;
                B=0;
            }

            decimal fractionalSector;
            decimal sectorNumber;
            decimal sectorPos;
            sectorPos = (Convert.ToDecimal(H)/255*360)/60;
            sectorNumber = Convert.ToInt32(Math.Floor(Convert.ToDouble(sectorPos)));
            fractionalSector = sectorPos - sectorNumber;

            decimal p;
            decimal q;
            decimal t;

            decimal r=0;
            decimal g=0;
            decimal b=0;
            decimal ss=Convert.ToDecimal(S)/255;
            decimal vv=Convert.ToDecimal(V)/255;
            
            
            p =vv * (1 - ss);
            q = vv * (1 - (ss * fractionalSector));
            t = vv * (1 - (ss * (1 - fractionalSector)));
          
            switch (Convert.ToInt32(sectorNumber))
            {
                case 0:
                
                    r =vv;
                    g = t;
                    b = p;
                    break;
            
                case 1:
                    r = q;
                    g = vv;
                    b = p;
                    break;
                case 2:
                
                    r = p;
                    g = vv;
                    b = t;
                    break;
                case 3:
                
                    r = p;
                    g = q;
                    b = vv;
                    break;
                case 4:
                
                    r = t;
                    g = p;
                    b = vv;
                    break;
                case 5:
                
                    r = vv;
                    g = p;
                    b = q;
                    break;    
            }
            R= Convert.ToInt32(r * 255);  
            G= Convert.ToInt32(g * 255);  
            B= Convert.ToInt32(b * 255);  
     
        }
        /**//// <summary>
        /// RgbtoCmy
        /// </summary>
        /// <param name="R"></param>
        /// <param name="G"></param>
        /// <param name="B"></param>
        public void RgbToCmyk(decimal R,decimal G,decimal B)
        {
            C = Convert.ToInt32((255 - Math.Abs(R)) * 100 / 255);
       
            M = Convert.ToInt32((255 - Math.Abs(G)) * 100 / 255);
      
            Y = Convert.ToInt32((255 - Math.Abs(B)) * 100 / 255);
        }
    }
}