网上几种算法中速度相对较快的

1. public static Bitmap MakeGrayscale(Bitmap original)
   
2. {
   
3.     //create a blank bitmap the same size as original
   
4.     Bitmap newBitmap = new Bitmap(original.Width, original.Height);
   
5. 
   
6.     //get a graphics object from the new image
   
7.     Graphics g = Graphics.FromImage(newBitmap);
   
8. 
   
9.     //create the grayscale ColorMatrix
   
10.     System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(
    
11.        new float[][]
    
12.       {
    
13.          new float[] {.3f, .3f, .3f, 0, 0},
    
14.          new float[] {.59f, .59f, .59f, 0, 0},
    
15.          new float[] {.11f, .11f, .11f, 0, 0},
    
16.          new float[] {0, 0, 0, 1, 0},
    
17.          new float[] {0, 0, 0, 0, 1}
    
18.       });
    
19. 
    
20.     //create some image attributes
    
21.     System.Drawing.Imaging.ImageAttributes attributes = new System.Drawing.Imaging.ImageAttributes();
    
22. 
    
23.     //set the color matrix attribute
    
24.     attributes.SetColorMatrix(colorMatrix);
    
25. 
    
26.     //draw the original image on the new image
    
27.     //using the grayscale color matrix
    
28.     g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);
    
29. 
    
30.     //dispose the Graphics object
    
31.     g.Dispose();
    
32.     return newBitmap;
    
33. }

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   网上几种算法中速度相对较快的

1. public static Bitmap MakeGrayscale(Bitmap original)
   
2. {
   
3.     //create a blank bitmap the same size as original
   
4.     Bitmap newBitmap = new Bitmap(original.Width, original.Height);
   
5. 
   
6.     //get a graphics object from the new image
   
7.     Graphics g = Graphics.FromImage(newBitmap);
   
8. 
   
9.     //create the grayscale ColorMatrix
   
10.     System.Drawing.Imaging.ColorMatrix colorMatrix = new System.Drawing.Imaging.ColorMatrix(
    
11.        new float[][]
    
12.       {
    
13.          new float[] {.3f, .3f, .3f, 0, 0},
    
14.          new float[] {.59f, .59f, .59f, 0, 0},
    
15.          new float[] {.11f, .11f, .11f, 0, 0},
    
16.          new float[] {0, 0, 0, 1, 0},
    
17.          new float[] {0, 0, 0, 0, 1}
    
18.       });
    
19. 
    
20.     //create some image attributes
    
21.     System.Drawing.Imaging.ImageAttributes attributes = new System.Drawing.Imaging.ImageAttributes();
    
22. 
    
23.     //set the color matrix attribute
    
24.     attributes.SetColorMatrix(colorMatrix);
    
25. 
    
26.     //draw the original image on the new image
    
27.     //using the grayscale color matrix
    
28.     g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);
    
29. 
    
30.     //dispose the Graphics object
    
31.     g.Dispose();
    
32.     return newBitmap;
    
33. }

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