Hi!

Please don't post off the list. 

I am under the impression that you are preparing the array in the wrong
way: not only you need to have a 480x640 matrix for 640x480 image, but
it also have to be transposed correctly.

Also, if you need luminance only why wouldn't you just use the grayscale
mode?
 
-- 
Sincerely yours,
Yury V. Zaytsev

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