If you don't care about quality then JPEG is an option... ;-) I also wonder if there are ways to create true 8-bit output in other ways. No way GD comes back.
On Tue, May 18, 2021 at 1:12 PM Richard Greenwood < [email protected]> wrote: > Oops - typo there, reducing the colors from 256 to *125* reduced the > image size by about 15%. > > On Tue, May 18, 2021 at 12:11 PM Richard Greenwood < > [email protected]> wrote: > >> Bob - I think GD was quite unpopular with the developers. Thomas Bonfort >> was pretty adamant about removing it. I'm hoping that there may be options >> in AGG. >> >> Seth - FORMATOPTION "COMPRESSION=9" only reduced the size by about 3% in >> my lines and text test case. >> >> Even - the default AGG/PNG8 has QUANTIZE_FORCE=on >> and QUANTIZE_COLORS=256. I think I remember you saying somewhere that >> reducing the number of colors mostly just reduced the pallet size and >> that's pretty much what I see. e.g. reducing the pallet from 256 to 15 >> colors reduces the image size by about 15% in my lines and text test. >> >> Thanks all for the suggestions. >> Rich >> >> >> On Tue, May 18, 2021 at 11:49 AM Even Rouault <[email protected]> >> wrote: >> >>> Forcing paletted images using QUANTIZE_FORCE=on and decreasing the number >>> of colors with QUANTIZE_COLORS can also help: >>> >>> FORMATOPTION "QUANTIZE_FORCE=on" >>> FORMATOPTION "QUANTIZE_COLORS=200" >>> >>> Le 18/05/2021 à 19:30, Seth G a écrit : >>> >>> 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]> >>> <[email protected]> on behalf of Richard >>> Greenwood <[email protected]> <[email protected]> >>> *Date: *Tuesday, May 18, 2021 at 11:50 AM >>> *To: *"[email protected]" >>> <[email protected]> <[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] >>> https://lists.osgeo.org/mailman/listinfo/mapserver-users >>> >>> >>> >>> _______________________________________________ >>> mapserver-users mailing >>> [email protected]https://lists.osgeo.org/mailman/listinfo/mapserver-users >>> >>> -- http://www.spatialys.com >>> My software is free, but my time generally not. >>> >>> _______________________________________________ >>> mapserver-users mailing list >>> [email protected] >>> https://lists.osgeo.org/mailman/listinfo/mapserver-users >>> >> >> >> -- >> Richard W. Greenwood, PLS >> www.greenwoodmap.com >> > > > -- > Richard W. Greenwood, PLS > www.greenwoodmap.com > _______________________________________________ > mapserver-users mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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