[Mapserver-users] GeoTiff output color problems

[Matthew Perry]

Frank,
Thanks for the reply. 

I get the same strange colors when using IMAGEMODE
RGBA. We are using the following setup:

GDAL 1.1.9.0, released 2003/06/27

MapServer version 4.0.1 OUTPUT=PNG OUTPUT=JPEG
OUTPUT=WBMP SUPPORTS=PROJ SUPPORTS=FREETYPE
SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT
SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT INPUT=EPPL7
INPUT=JPEG INPUT=POSTGIS INPUT=OGR INPUT=GDAL
INPUT=SHAPEFILE

I noticed there is no OUTPUT=TIFF ??? Is this not
shown since it is handled by the GDAL libs? 

Other than geotiff output, the setup works fine. I do
not have administrative privleges on this server so I
am not at liberty to experiment with 4.2. What would
you suggest for next steps...  upgrade GDAL, upgrade
Mapserver, or both?? 

Thanks for your help! 

- matt



--- Frank Warmerdam <warmerdam at pobox.com> wrote:
> Matthew Perry wrote:
> > Hello folks,
> >  
> > Testing a new intallation of mapserver here and
> I'm getting some wierd 
> > results when outputting Geotiffs:
> >  
> > When I use the following:
> >  
> > OUTPUTFORMAT 
> >   NAME GTiff
> >   DRIVER "GDAL/GTiff"
> >   MIMETYPE "image/tiff"
> >   IMAGEMODE PC256           
> >   EXTENSION "tif"
> > END
> >  
> > I get this image:
> http://ktrin.cnrs.humboldt.edu/misc/gtiff_256.tif
> >  
> > This has the correct colors but poor quality, plus
> I would like to have 
> > 24 bit output. So I tried the following:
> 
> Matthew,
> 
> I'm not sure how you generated this.  It should have
> the same colors
> that you would find if you did png output.
> 
> > OUTPUTFORMAT 
> >   NAME GTiff
> >   DRIVER "GDAL/GTiff"
> >   MIMETYPE "image/tiff"
> >   IMAGEMODE RGB           
> >   EXTENSION "tif"
> > END
> >  
> > which gives me this image with bizzare colors (but
> better resolution): 
> > http://ktrin.cnrs.humboldt.edu/misc/gtiff_rgb.tif
> >  
> > Both images are properly georeferenced, though. I
> have tried reversing 
> > the order of the bands (in ArcMap 8.3) to no
> avail.
> >  
> > Any ideas why the Geotiff 24bit color would be
> innacurate?
> 
> It looks like a color band mixup of some sort.  The
> blue band seems to really
> be alpha values.  Try IMAGEMODE RGBA and see if the
> result is any better.
> I would appreciate your submitting a bugzilla report
> about the RGB output if
> you can boil it down to something easy to reproduce
> with MapServer 4.2.
> 
> PS. please assign the bug report directly to me.
> 
> Best regards,
> -- 
>
---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank
> Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows |
> http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial
> Programmer for Rent
>