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-
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