I found this *really* useful comment in the Python source for the Python Image Library. Guess I should have remembered this from Uni, but never mind!
When translating a colour image to black and white (mode "L"), the library uses the ITU-R 601-2 luma transform:
L = R * 299/1000 + G * 587/1000 + B * 114/1000
technorati tags: python, image, PIL, colour, color, transform, luma, RGB
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