Andrew Chamberlain wrote:
> The reason I ask is because I'm trying to calculate a
> ratio image between two bands in an RGB image, and was hoping the
> ImageMath module in 1.1.5 might be able to help.
If speed does not matter much, something like this should work:
im = Image.open('some rgb image')
im2 = Image.new('L', im.size)
SCALE = 128
ratios = [min(int(SCALE * r / (g + 0.01)), 255)
for r, g, b in im.getdata()]
im2.putdata(ratios)
im2.save('/tmp/ratio.png')
douglas
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