Hi,
I put the following question on the GRASS user list. It isn't possible
with GRASS (or the programs mentioned by Glynn), but if someone on this
list can help me further, I would be very grateful. I have been
struggling for some time with this problem, and I'll have to process
lots of scanned old maps in the near future.
Jan
Jan Hartmann wrote:
> I am working with series of old topographical maps, ranging 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 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 <gl...@gclements.plus.com>
_______________________________________________
gdal-dev mailing list
gdal-dev@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/gdal-dev
