After reading this blog entry about using PNGNQ which I have also been using,I thought it would interesting to do a quick and dirty comparison
All images where created just using the default command line options,
i.e. util.exe filename.png
Imagery was sourced from http://www.unearthedoutdoors.net/global_data/true_marble/download
| MapGuide PNG32 2.0.2 138.174 Kb | NQ8 pngnq 0.5 56.055 Kb | |
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| NQ8+pngcrush 1.6.10 49.762 Kb | NQ8+OptiPNG 0.6.1 49.420 Kb | MapGuide PNG8 2.0.2 38.728 Kb |
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It turns out that MapGuide comes out on top in when configured for PNG8 :)
Now if only the GDAL FDO provider was stable...
2 comments:
Hi, can you please point me to the algorithms MapGuide is using to optimize PNG8 to this form?
Will it correctly convert true alpha channels (not only two/state) as well?
I mean images like this: http://trac.osgeo.org/gdal/attachment/ticket/1939/1244-nq8.png?format=raw
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