Thanks to several helpful replies to my previous thread I know that the increased image size between MapServer 6 with the GD driver and MapServer 7 with the AGG driver is due to differences in anti-aliasing (and lack of) in the two drivers. (AGG features anti-aliasing and sub-pixel resolution <https://en.wikipedia.org/wiki/Anti-Grain_Geometry>).
Gamma setting from 0-1 affects the size of a filled polygon layer by a factor of almost 3x. But gamma has no effect on text, lines, and polygon outlines. So images comprised of these types of features are approximately 2x larger with the AGG/PNG8 driver than with the GD/GIF driver. Where else should I be looking to reduce my images sizes? I serve rural areas with poor internet so in my case, smaller image sizes are more important than higher quality images. Thanks, Rich -- Richard W. Greenwood, PLS www.greenwoodmap.com
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