Jukka, please create a ticket and attach your test case, I'll have a look. thanks, thomas
On Mon, Apr 18, 2011 at 10:18, Rahkonen Jukka <jukka.rahko...@mmmtike.fi> wrote: > Hi, > > I am sometimes getting images with totally odd colours with MS 6.0 beta 6 > (and the previous beta versions) with format image/png; mode=8bit. I have > been doing some testing and I believe I can now reproduce the error. > > The error happens only if the raster image has overviews. If I delete or > rename the external .ovr file the 8bit png output is correct at any scales. > To be sure that there is nothing odd with the overview file I recreated it > with FWTools v. 2.4.2 by using a basic command > gdaladdo -r average -ro suomi1m.tif 2 4 8 > > I prepared also my own outputformat so I could compare the outputs from MS > 6.0 and older MS 5.6.5 version. This is my outputformat which I have > understood to mean just the same as the inbuild MS 6.0 outputformat > "image/png; mode=8bit". > OUTPUTFORMAT > NAME 'AGG_Q' > MIMETYPE "image/png" > DRIVER "AGG/PNG" > EXTENSION "png" > IMAGEMODE RGB > FORMATOPTION "QUANTIZE_FORCE=ON" > FORMATOPTION "QUANTIZE_DITHER=OFF" > FORMATOPTION "QUANTIZE_COLORS=256" > END > > With this outputformat the resulting map is correct with MS 5.6.5 at any > scales even if the .ovr file is in use. > > My conclusion is that exectly MS 6.0 version is creating at some scales > through ADD driver an 8 bit png output with messed up colours, but it > happens only if the source image has overviews. > > If someone is interested in having a look at this I can prepare and send my > mapfile and some imagery to play with. > > -Jukka Rahkonen- > _______________________________________________ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users