[IMAGE-SIG] histogram

[Yu Jiang]

Hi Everybody,

I created a big image by merging a number of small images together using PIL. However, the 
big image looks like a chess board because the histograms of the each small images are different.
I want to smooth the chess board like stuff by uniting the histogram of the big image.
I wonder anybody can give me any hint of doing so?
Thanks!

Huey

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