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List:       grass-user
Subject:    Re: [GRASS-user] Calibrating colors of a series of maps
From:       Glynn Clements <glynn () gclements ! plus ! com>
Date:       2009-12-26 11:54:05
Message-ID: 19253.63837.874908.808500 () cerise ! gclements ! plus ! com
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Jan Hartmann wrote:

> I am working with series of old topographical maps, rangnig from 10 to 
> 600 map sheets per map. Each sheet is discolored a bit from age. How can 
> I process a complete series in such a way that there are no differences 
> visible any more between map sheets? Preferably I would like to 
> downsample them to 8 bits color table, as the originals only have a 
> small set of colors. In other words: how do I calibrate s set of maps to 
> the same optimal color table?

This is probably better done with general image-processing software,
e.g. pnmquant (from the Netpbm package) or "convert -colors ..." (from
ImageMagick).

-- 
Glynn Clements <glynn@gclements.plus.com>
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