[SIP-devel] I need some tips on how to equailze an indexed image

[Zhang C. <ch...@ma...>]

Hi, guys!

    Because I'm unable to locate the bug which causes mogrify() crash, I 
decide to write a new set of functions to replace mogrify(). I've 
written a function called histeq() to equalize a grayscale image, and 
now I want to write some codes to handle with indexed image(color 
image), but I don't know how to do that. I read Matlab's source code and 
manual of histeq(), but I'm still confused. I know I should convert RGB 
colormap to YIQ colormap, and equalize component Y, but I don't know 
what should I do to adjust I and Q. Could you give me some tips or some URL?