Thanks Frederik.
I had tested pngnq before. the result is a bit better than imagemagick in
some PNGs...
Should do a same test on a same PNG with the other 2 as well..
I will publish the results soon: ImageMagick, PngCrush, OptiPng, Pngnq and
photoshop.

I wish one day mapnik could make the most compressed png for us. A lot of
computation power will be saved.

Alireza





Have a look at pngcrush, optipng, or pngnq.
>
> Bye
> Frederik
>
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