c# 颜色RGB到HSB互相转换

 /// <summary>
         /// 色相，饱和度，亮度转换成rgb值
         /// </summary>
         /// <returns></returns>
         public static float[] HSB2RGB(float[] hsb)
         {
             if (hsb[] == )
             {
                 hsb[] = ;
             }
             float[] rgb = new float[];
             float r = ;
             float g = ;
             float b = ;

             if (hsb[] == )
             {
                 r = g = b = hsb[];
             }
             else
             {
                 float sectorPos = hsb[] / 60f;
                 int sectorNum = (int)Math.Floor(sectorPos);
                 float fractionalSector = sectorPos - sectorNum;
                 float p = hsb[] * ( - hsb[]);
                 float q = hsb[] * ( - (hsb[] * fractionalSector));
                 float t = hsb[] * ( - (hsb[] * ( - fractionalSector)));
                 switch (sectorNum)
                 {
                     case :
                         r = hsb[];
                         g = t;
                         b = p;
                         break;
                     case :
                         r = q;
                         g = hsb[];
                         b = p;
                         break;
                     case :
                         r = p;
                         g = hsb[];
                         b = t;
                         break;
                     case :
                         r = p;
                         g = q;
                         b = hsb[];
                         break;
                     case :
                         r = t;
                         g = p;
                         b = hsb[];
                         break;
                     case :
                         r = hsb[];
                         g = p;
                         b = q;
                         break;
                 }

             }
             return new float[] { r * , g * , b *  };
         }
         /// <summary>
         /// 将rgb类型的颜色转换为hsb
         /// </summary>
         /// <param name="rgb"></param>
         /// <returns></returns>
         public static float[] RGB2HSB(float[] rgb)
         {
             float[] hsb = new float[];
             float r = rgb[];
             float g = rgb[];
             float b = rgb[];

             float max = Math.Max(r, Math.Max(g, b));
             if (max <= )
             {
                 return hsb;
             }
             float min = Math.Min(r, Math.Min(g, b));
             float dif = max - min;
             if (max > min)
             {
                 if (g == max)
                 {
                     hsb[] = (b - r) / dif * 60f + 120f;
                 }
                 else if (b == max)
                 {
                     hsb[] = (r - g) / dif * 60f + 240f;
                 }
                 else if (b > g)
                 {
                     hsb[] = (g - b) / dif * 60f + 360f;
                 }
                 else
                 {
                     hsb[] = (g - b) / dif * 60f;
                 }
                 if (hsb[] < )
                 {
                     hsb[] = hsb[] + 360f;
                 }
             }
             else
             {
                 hsb[] = ;
             }
             hsb[] = dif / max;
             hsb[] = max / 255f;
             return hsb;
         }