[Image-SIG] Re: help converting images
Fredrik Lundh
fredrik@pythonware.com
Fri, 16 May 2003 15:10:58 +0200
I wrote:
> you can also use point to process each band individually:
>
> bands = (
> im.point(lambda x: x*0.3), # 30% to red
> im.point(lambda x: x*0.6), # 60% to green
> im.point(lambda x: x*0.2), # 20% to blue
> )
another way to do this is to prepare a lookup table, and
use the "putpalette" method to convert the "L" image into
a "P" image, before converting it to RGB:
im = Image.open("some monochrome image")
# built a palette [red0, green0, blue0, red1, green1, blue1, ...]
lut = []
for i in range(256):
lut.extend((i*0.5, i*0.6, i*0.1))
im.putpalette(lut)
im = im.convert("RGB")
</F>