Converts RGB to HSL - CSharp System.Drawing

CSharp examples for System.Drawing:Color Convert

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Description

Converts RGB to HSL

Demo Code


using System.Windows.Media;
using System.Threading.Tasks;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;//from   w  w w.  jav  a 2 s . c  o m

public class Main{
        //
      /// <summary>
      /// Converts RGB to HSL
      /// </summary>
      /// <returns>An HSL value</returns>
      public static HSL ToHsl(this Color c)
      {
         HSL hsl = new HSL();

         hsl.H = c.GetHue() / 360.0; // we store hue as 0-1 as opposed to 0-360
         hsl.L = c.GetBrightness();
         hsl.S = c.GetSaturation();

         return hsl;
      }
        public static float GetBrightness(this Color c)
      {
         byte minval = Math.Min(c.R, Math.Min(c.G, c.B));
         byte maxval = Math.Max(c.R, Math.Max(c.G, c.B));

         return (float)(maxval + minval) / 510;
      }
        public static float GetSaturation(this Color c)
      {
         byte minval = (byte)Math.Min(c.R, Math.Min(c.G, c.B));
         byte maxval = (byte)Math.Max(c.R, Math.Max(c.G, c.B));

         if (maxval == minval)
            return 0.0f;

         int sum = maxval + minval;
         if (sum > 255)
            sum = 510 - sum;

         return (float)(maxval - minval) / sum;
      }
        public static float GetHue(this Color c)
      {
         var r = c.R;
         var g = c.G;
         var b = c.B;
         byte minval = (byte)Math.Min(r, Math.Min(g, b));
         byte maxval = (byte)Math.Max(r, Math.Max(g, b));

         if (maxval == minval)
            return 0.0f;

         float diff = (float)(maxval - minval);
         float rnorm = (maxval - r) / diff;
         float gnorm = (maxval - g) / diff;
         float bnorm = (maxval - b) / diff;

         float hue = 0.0f;
         if (r == maxval)
            hue = 60.0f * (6.0f + bnorm - gnorm);
         if (g == maxval)
            hue = 60.0f * (2.0f + rnorm - bnorm);
         if (b == maxval)
            hue = 60.0f * (4.0f + gnorm - rnorm);
         if (hue > 360.0f)
            hue = hue - 360.0f;

         return hue;

      }
}

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