[mapserver-users] Can't remove artifacts aroung polygons with Mapserver 6.0.3

[Stephen Woodbridge]

Add an OUTLINEWIDTH 1 to your polygons. That will fix it. This is a know 
upgrade issue because the rendering math changed.

You might also need to add OUTLINECOLOR ... the same as you polygon 
COLOR, but I think it will default to that if it is missing.

-Steve W

On 10/23/2013 2:28 PM, Ei Fujioka wrote:
> 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,
>