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.
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