. Net uses GDI + to improve GIF image quality code

Use GDI + in. net to improve the image quality of GIF images, which is the "REE" algorithm. The "REE" algorithm allows us to insert our own algorithms to quantize our images.

It is convenient to use octreequantizer:

Hide row number copy code? Code

1.  system.drawing.bitmap b = new System.Drawing.Bitmap("c:\original_image.gif");  

2. System.Drawing.Image thmbnail = b.GetThumbnailImage(100,75,null,new IntPtr()); 

3. OctreeQuantizer quantizer = new OctreeQuantizer ( 255 , 8 ) ; 

4. using ( Bitmap quantized = quantizer.Quantize ( thmbnail ) ) 

5. { 

6.      quantized.Save("c:\thumnail.gif", System.Drawing.Imaging.ImageFormat.Gif); 

7. } 

8. octreequantizer grayquantizer = new GrayscaleQuantizer ( ) ; 

9. using ( Bitmap quantized = grayquantizer.Quantize ( thmbnail ) ) 

10. { 

11.      quantized.Save("c:\thumnail.gif", System.Drawing.Imaging.ImageFormat.Gif); 

12. }