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|
|NQ8+pngcrush 1.6.10 49.762 Kb||NQ8+OptiPNG 0.6.1 49.420 Kb||MapGuide PNG8 2.0.2 38.728 Kb|
It turns out that MapGuide comes out on top in when configured for PNG8 :)
Now if only the GDAL FDO provider was stable...