I do automatically switch to JPEG when there's imagery or similar content and could use JPEG more except where I need transparency, like when overlaying a tiled background layer in OpenLayers. I messed with the Cairo driver a little but it seems less flexible than AGG. I haven't been too happy with vector tiles. And yeah, I know GD isn't an option. Thanks Steve.
On Tue, May 18, 2021 at 1:30 PM Steve Lime <[email protected]> wrote: > 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 >> > -- Richard W. Greenwood, PLS www.greenwoodmap.com
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