Hello,
I've upgraded Mapserver from 5.2 to 6.0.3 and struggling in removing
artifacts that appear around polygons. I didn't see this problem with 5.2.
See the screen shots of the same tile with 5.2 and 6.0 followed by
OUTPUTFORMAT definition.
5.2
http://seamap-dev.env.duke.edu/cache/images/mapserver_52_gd_png_rgba.png
OUTPUTFORMAT
NAME "PNG"
MIMETYPE "image/png"
DRIVER "GD/PNG"
EXTENSION "png"
IMAGEMODE "RGBA"
TRANSPARENT TRUE
END
6.0
http://seamap-dev.env.duke.edu/cache/images/mapserver_6_agg_png_rgba.png
OUTPUTFORMAT
NAME "PNG"
MIMETYPE "image/png"
DRIVER "AGG/PNG"
EXTENSION "png"
IMAGEMODE RGBA
TRANSPARENT TRUE
FORMATOPTION "GAMMA=0.7"
END # OUTPUTFORMAT
You can see whitish lines around the small squares in 6.0.
I changed GAMMA=xxx (e.g. 1.0, 0.5, 0.0) but it doesn't seem to have any
effects on the image.
When I set IMAGEMODE to PC256, the artifacts disappear but I need it to
be transparent. The document
(http://mapserver.org/mapfile/outputformat.html) mentions that PC256 is
only supported by GD/GIF and GD/PNG but it seems working with AGG/PNG.
Could someone give me advice how to remove the artifacts?
Do I simply need to upgrade to 6.4?
(I didn't as it's not available from RPM)
Here is the output of mapserv -v.
MapServer version 6.0.3 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ
SUPPORTS=AGG SUPPORTS=CAIRO SUPPORTS=FREETYPE SUPPORTS=ICONV
SUPPORTS=FRIBIDI SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT
SUPPORTS=WFS_SERVER SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER
SUPPORTS=SOS_SERVER SUPPORTS=FASTCGI SUPPORTS=THREADS SUPPORTS=GEOS
INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE
Thanks,
--
========================
Ei Fujioka
Research Scientist
Nicholas School
Duke University
(919) 613-8021 Ext. 2
[email protected]
========================
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