[Mapserver-users] colouring problems when serving 24 bit rasters in 8 bit output mode
Bart van den Eijnden
bartvde at xs4all.nl
Sat May 29 07:10:27 PDT 2004
Hi list,
for anybody wanting to serve 24 bit rasters and not wanting to use 24 bit
output in Mapserver, it is possible that by default the colours will
change. I had this problem and in an e-mail from December 2003 Frank
Warmerdam suggested it might be possible to trick Mapserver into using the
most common colours in your raster by using a dummy layer with as many
CLASS objects as colours needed.
Frank has now looked into this in more detail, and it seems this option is
not possible.
So it is best practice for everybody in the same situation to preprocess
their rasters to 8 bit mode. Their is a great utility available for this
in GDAL called rgb2pct.py (you can e.g. download it with OpenEV_FW).
For anybody wanting to read the full bug report with all the information
in it, see:
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=684
Thanks again Frank!
Best regards,
Bart
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