From: [EMAIL PROTECTED] on behalf of Fredrik Lundh
Sent: Sun 8/28/2005 1:27 PM
To: [email protected]
Subject: Re: [Image-SIG] Dithering
Christian M. Jensen wrote:
> I need to take a 256
level gray image down to 32 levels with nice
> dithering. What is the best
process for doing that?
unless I'm missing something, I don't think you
can do that in 1.1.5
(unless you want to do the dithering by
hand).
the core library can do dithering both to fixed palettes and
optimal
palettes, but PIL's convert method only exposes the "dither to
web
palette" and "map to nearest N color" variants.
(if you want to do
manual dithering, use quantize(32) on the source
image to get a reference
image, take the difference between them,
and propagate the errors in some
suitable
way)
</F>
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