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
<https://mapserver.org/mapfile/outputformat.html>
The default is 6.
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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 <http://www.greenwoodmap.com>
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