I've not used it but the following might help for the AGG/PNG driver: FORMATOPTION "COMPRESSION=9"
https://mapserver.org/mapfile/outputformat.html The default is 6. -- web:http://geographika.co.uk twitter: @geographika On Tue, May 18, 2021, at 7:16 PM, Basques, Bob (CI-StPaul) wrote: > All, > > I know the GD stuff has been a long running conversation in the MapServer > realm, but does this indicate that maybe discussing something on adding GD > back in might be prudent? Or are there methods to get down to these previous > files sizes with the newer approaches? > > I have the same concerns related to image size from the performance side, and > running on Mobile in our case. > > Bobb > > > *From: *mapserver-users <[email protected]> on behalf > of Richard Greenwood <[email protected]> > *Date: *Tuesday, May 18, 2021 at 11:50 AM > *To: *"[email protected]" <[email protected]> > *Subject: *[mapserver-users] anti-aliasing (was differing image size with > different mapserver versions) > > *Think Before You Click: *This email originated *outside *our organization. > > 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 > > _______________________________________________ > mapserver-users mailing list > [email protected] <mailto:mapserver-users%40lists.osgeo.org> > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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