Problem with reprojected images

[Dirk Jesko]

Hi,

I set up a WMS for aerial images. The images are projected in 
Gauss-Krueger 3 and have a size of one square kilometer. The WMS also 
provides other projections, e.g. Gauss-Krueger 2-5, UTM, etc. If I query 
the WMS with a projection other than the original one, I get little 
white lines along the edges of the tiles (see the attached image). The 
image format does not matter. How do I get rid of these? I can not find 
any option that might be related to this. By the way, this also happens 
if the data is accessed via mapscript or as normal cgi.

Thanks for any help.

Regards,
Dirk

Here a part of the mapfile:

MAP
 ...
 IMAGECOLOR      255 255 255
 EXTENT          3100000 5200000 4100000 6200000
 SIZE            500 500
 SHAPEPATH       "/data/daten/WMS"

 PROJECTION
   "init=epsg:31467"     # GK 3
 END

 WEB
   METADATA
     ...
     "wms_srs" "EPSG:31467 EPSG:31466 EPSG:31468 EPSG:31469 EPSG:32632 
EPSG:32633 EPSG:4326"
     "wms_encoding" "UTF-8"
     "wms_feature_info_mime_type" "application/vnd.ogc.gml"
   END

   MAXSCALE   10000000
   MINSCALE   1000

   ...
 END

 OUTPUTFORMAT
   NAME png24
   DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE RGB
   EXTENSION "png"
   FORMATOPTION "INTERLACE=ON"
 END
 OUTPUTFORMAT
   NAME png
   DRIVER "GD/PNG"
   MIMETYPE "image/png"
   IMAGEMODE PC256
   EXTENSION "png"
   FORMATOPTION "INTERLACE=ON"
 END
 OUTPUTFORMAT
   NAME jpeg
   DRIVER "GD/JPEG"
   MIMETYPE "image/jpeg"
   IMAGEMODE RGB
   EXTENSION "jpg"
   FORMATOPTION "QUALITY=95"
   FORMATOPTION "PROGRESSIVE=ON"
 END

 ...

 LAYER
   NAME         "img02000"
   GROUP        "img"
   TILEINDEX    "IMG_02000.shp"
   TILEITEM     "locationUn"
   TYPE         RASTER
   MAXSCALE     500000.0
   MINSCALE     100000.0
   PROJECTION
     "init=epsg:31467"     # GK 3
   END
   METADATA
      ...
   END
 END

 ...

END
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