[mapserver-users] polygon border artifacts
thomas bonfort
thomas.bonfort at gmail.com
Thu May 10 07:57:37 PDT 2012
you can fiddle with gamma correction in mapserver trunk, c.f.
https://twitter.com/#!/tbonfort/status/93284998249066496
OUTPUTFORMAT
DRIVER AGG/PNG
...
FORMATOPTION "GAMMA=0.7" #valid from 0 to 1
END
--
thomas
On Fri, May 4, 2012 at 12:16 PM, Sven Geggus
<lists at fuchsschwanzdomain.de> wrote:
> Hello,
>
> the brilliant osm coastline tool from Jochen Topf
> (http://blog.jochentopf.com/2012-04-19-more-coastlines-stuff.html)
> enables for creating nice ocean or landcover polygons from
> Openstreetmap data. Well, this is where my mapserver problem
> starts...
>
> For illustration of the problem I just created ocean polygons around
> canary islands
>
> http://home.geggus.net/pub/ocean-canary-islands.zip
>
> They are in sperical mercator using a huge overlap of 30meters to
> avoid artifacts.
> However artifacts (which seem to depend on scale) still arise:
>
> http://home.geggus.net/pub/ocean.png
>
> Here is the mapfile and shp2img command I used for rendering:
>
> shp2img -o ocean.png -m ocean.map -e -1917656.09 3248262.91 -1839384.59 3326534.41 -s 512 512
>
> MAP
>
> OUTPUTFORMAT
> NAME agg
> DRIVER AGG/PNG8
> FORMATOPTION "INTERLACE=OFF"
> MIMETYPE "image/png"
> END
>
> EXTENT -180 -85 180 85
>
> IMAGECOLOR 255 0 0
>
> WEB
> METADATA
> "ows_enable_request" "*"
> wms_srs "EPSG:4326 EPSG:3857"
> END
> END
>
> PROJECTION
> "init=epsg:3857"
> END
>
> LAYER
> PROCESSING "CLOSE_CONNECTION=DEFER"
> NAME "ocean"
> TYPE POLYGON
> STATUS ON
> DATA "ocean-canary-islands"
> PROJECTION
> "init=epsg:3857"
> END
> CLASS
> STYLE
> COLOR 128 255 255
> END
> END # of class
> END # of layer
> END
>
> The only workaround I found so far is to use an outline:
>
> OUTLINECOLOR 128 255 255
> WIDTH 1
>
> Is this a bug in mapserver or is there something else which I can do?
>
> Sven
>
> --
> "Ich fürchte mich nicht vor der Rückkehr der Faschisten in der Maske der
> Faschisten, sondern vor der Rückkehr der Faschisten in der Maske der
> Demokraten" (Theodor W. Adorno)
> /me is giggls at ircnet, http://sven.gegg.us/ on the Web
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