AW: [UMN_MAPSERVER-USERS] Image color problems

[Arnd Wippermann]

Hello Jason,
 
perhaps you have set
IMAGECOLOR 255 255 255
and
TRANSPARENT ON
in your mapfile
 
IMAGECOLOR [r] [g] [b] 
Color to initialize the map with (i.e. background color). When transparency
is enabled (TRANSPARENT ON) for the typical case of 8-bit pseudocolored map
generation, this color will be marked as transparent in the output file
palette. Any other map components drawn in this color will also be
transparenct, so for map generation with transparency it is best to use an
otherwise unused color as the background color. 

Mit freundlichen Grüssen

Arnd Wippermann
http://gis.ibbeck.de/pinguinale/



 
________________________________

Von: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] Im
Auftrag von Jason Sievers
Gesendet: Freitag, 15. September 2006 20:14
An: MAPSERVER-USERS at LISTS.UMN.EDU
Betreff: [UMN_MAPSERVER-USERS] Image color problems


I have built a raster catalog and am display orthophotos in my MapServer
application.  Some of my TIFF images are rendered with incorrect color.
Here is an example:
http://www.co.linn.or.us/webmap/ELLAMaps1.0/badcolor.png.  This is an 8-bit
TIFF input and MapServer outputs it as an 8-bit png.  It seems that the
really dark (black or very close to it) pixels are rendered white by
MapServer.  The original image does not have these white pixels.  I've read
through the Raster HOW-TO and played with OUTPUTFORMAT but with no success.
Thanks for any help.
Jason Sievers 
jsievers at co.linn.or.us 
Linn County GIS Department 
Albany, OR 97321 

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