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From: Michal Kvasnicka <quasar@econ.muni.cz>
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Subject: Re: Dithering (off-topic)
Date: Tue, 04 Nov 2003 14:34:54 +0100
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Dear Sir,

many thanks for your kind help. This is precisely what I was searching for.

Bill McClain wrote:

>   pnmscale -width=1950 pleiades.pnm | pnmsmooth -size 5 5 | pgmtopbm
>-fs -value 0.5 | pnmtopng > pleiades.png
>

BTW, is there some easy way to set the size of the dithering points (eg. 
2x2 pixels, 3x3 pixels), or should I do it ex post in some image editor 
(Gimp, imagemagick)?

Many thanks once more.
M.K.