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Color processing is basic function for image processing.
1. jpg  file is converted into bmp file or Bmp file is converted into jpg file.
2. 24bit colors file is converted into 16 bit  colors file
3 24bit colors file is converted into 12 bit colors file ( for tracking )
4. 24bit colors file is converted into 8 bit  colors file ( for example )
5. 24bit colors file is converted into  8 bit  grey level file 
6. 24bit colors file is converted into 4 bit  grey level file
7. 24bit colors file is converted into  binary  white & black file 

Processing data  in 24bit colors being convert into 256 colors  adopts
distance process, It creates  many aliasing ( like MSPAINTS package softare),  I adopts   tree method ( no aliasing ).


for example:
original lena.bmp (24 bit colors bmp file)
 檢視圖片 
after my program( octree.exe ) lena8.bmp(  256 colors bmp file )
 檢視圖片