I have be attempting to resize (downsample) a RGB image using the
python image library resize function. Everything works fine but I
would like to exclude black values 0,0,0 from the calculations. I
have tried creating a alpha mask based on black values then performing
the resize but that only create partially transparent tiles in the
regions that had black values
im = Image.open('src.tif')
multi = im.split
mask = im.point(lambda i: i == 0 and 255) # get 0 values
mask = mask.convert('L')
mask = ImageChops.invert(mask) # make the 0 values 255 for transparency
out_im = Image.merge('RGBA', (multi[0], multi[1], multi[2], mask))
out_im = out_im.resize((100, 100), Image.ANTIALIAS)
out_im = out_im.convert('RGB')
out_im.save('dst.tif')
Any help would be great
--
Travis K.
Toronto, Canada
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"She knows there's no success like failure
And that failure's no success at all."
-Bob Dylan-
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