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<pre>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"
<span class="s">
</span></pre>
<div class="moz-cite-prefix">Le 18/05/2021 à 19:30, Seth G a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:0ebd32c2-993c-4d63-9d0b-8df4f9af55dc@www.fastmail.com">
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<div>I've not used it but the following might help for the AGG/PNG
driver:<br>
</div>
<div><br>
</div>
<div>FORMATOPTION "COMPRESSION=9"<br>
</div>
<div><br>
</div>
<div><a href="https://mapserver.org/mapfile/outputformat.html"
moz-do-not-send="true">https://mapserver.org/mapfile/outputformat.html</a><br>
</div>
<div><br>
</div>
<div>The default is 6. <br>
</div>
<div><br>
</div>
<div id="sig62266145">
<div class="signature">--<br>
</div>
<div class="signature">web:<a class="moz-txt-link-freetext" href="http://geographika.co.uk">http://geographika.co.uk</a><br>
</div>
<div class="signature">twitter: @geographika<br>
</div>
</div>
<div><br>
</div>
<div><br>
</div>
<div>On Tue, May 18, 2021, at 7:16 PM, Basques, Bob (CI-StPaul)
wrote:<br>
</div>
<blockquote type="cite" id="qt" style="">
<div class="qt-WordSection1">
<p class="qt-MsoNormal">All,<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">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?<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">I have the same concerns related to
image size from the performance side, and running on Mobile
in our case.<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">Bobb<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<div
style="border-right-color:currentcolor;border-right-style:none;border-right-width:medium;border-bottom-color:currentcolor;border-bottom-style:none;border-bottom-width:medium;border-left-color:currentcolor;border-left-style:none;border-left-width:medium;border-image-outset:0;border-image-repeat:stretch;border-image-slice:100%;border-image-source:none;border-image-width:1;border-top-color:rgb(181,
196,
223);border-top-style:solid;border-top-width:1pt;padding-top:3pt;padding-right:0in;padding-bottom:0in;padding-left:0in;">
<p class="qt-MsoNormal" style="margin-left:0.5in;"><b><span
style="color:black;"><span class="size"
style="font-size:12pt;">From: </span></span></b><span
style="color:black;"><span class="size"
style="font-size:12pt;">mapserver-users
<a class="moz-txt-link-rfc2396E" href="mailto:mapserver-users-bounces@lists.osgeo.org"><mapserver-users-bounces@lists.osgeo.org></a> on
behalf of Richard Greenwood
<a class="moz-txt-link-rfc2396E" href="mailto:richard.greenwood@gmail.com"><richard.greenwood@gmail.com></a><br>
<b>Date: </b>Tuesday, May 18, 2021 at 11:50 AM<br>
<b>To: </b><a class="moz-txt-link-rfc2396E" href="mailto:mapserver-users@lists.osgeo.org">"mapserver-users@lists.osgeo.org"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:mapserver-users@lists.osgeo.org"><mapserver-users@lists.osgeo.org></a><br>
<b>Subject: </b>[mapserver-users] anti-aliasing (was
differing image size with different mapserver
versions)</span></span></p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;"> <br>
</p>
</div>
<table class="qt-MsoNormalTable"
style="margin-left:0.5in;background-color:rgb(226, 247,
0);background-position-x:0%;background-position-y:0%;background-repeat:repeat;background-attachment:scroll;background-image:none;background-size:auto;background-origin:padding-box;background-clip:border-box;border-top-color:black;border-top-style:solid;border-top-width:1pt;border-right-color:black;border-right-style:solid;border-right-width:1pt;border-bottom-color:black;border-bottom-style:solid;border-bottom-width:1pt;border-left-color:black;border-left-style:solid;border-left-width:1pt;border-image-outset:0;border-image-repeat:stretch;border-image-slice:100%;border-image-source:none;border-image-width:1;"
cellpadding="0" border="1">
<tbody>
<tr>
<td
style="border-top-color:currentcolor;border-top-style:none;border-top-width:medium;border-right-color:currentcolor;border-right-style:none;border-right-width:medium;border-bottom-color:currentcolor;border-bottom-style:none;border-bottom-width:medium;border-left-color:currentcolor;border-left-style:none;border-left-width:medium;border-image-outset:0;border-image-repeat:stretch;border-image-slice:100%;border-image-source:none;border-image-width:1;padding-top:0.75pt;padding-right:0.75pt;padding-bottom:0.75pt;padding-left:0.75pt;">
<p class="qt-MsoNormal" style=""><b><span
style="color:rgb(255, 51, 51);"><span
class="font"
style="font-family:"Calibri",
sans-serif;">Think Before You Click: </span></span></b><span
style="color:black;">This email originated <b><span
style=""><span class="font"
style="font-family:"Calibri",
sans-serif;">outside </span></span></b>our
organization.</span><br>
</p>
</td>
</tr>
</tbody>
</table>
<p class="qt-MsoNormal" style="margin-left:0.5in;"> <br>
</p>
<div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;">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 <a
href="https://en.wikipedia.org/wiki/Anti-Grain_Geometry"
moz-do-not-send="true"> features anti-aliasing and
sub-pixel resolution</a>).<br>
</p>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;"> <br>
</p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;">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. <br>
</p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;"> <br>
</p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;">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.<br>
</p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;"> <br>
</p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;">Thanks,<br>
</p>
</div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;">Rich<br>
</p>
</div>
<div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;"> <br>
</p>
</div>
<p class="qt-MsoNormal" style="margin-left:0.5in;">--<br>
</p>
<div>
<div>
<p class="qt-MsoNormal" style="margin-left:0.5in;"><br>
</p>
<div>Richard W. Greenwood, PLS<br>
</div>
<div> <a href="http://www.greenwoodmap.com"
target="_blank" moz-do-not-send="true">www.greenwoodmap.com</a><br>
</div>
<p><br>
</p>
</div>
</div>
</div>
</div>
</div>
</div>
<div>_______________________________________________<br>
</div>
<div>mapserver-users mailing list<br>
</div>
<div><a href="mailto:mapserver-users%40lists.osgeo.org"
moz-do-not-send="true">mapserver-users@lists.osgeo.org</a><br>
</div>
<div><a
href="https://lists.osgeo.org/mailman/listinfo/mapserver-users"
moz-do-not-send="true">https://lists.osgeo.org/mailman/listinfo/mapserver-users</a><br>
</div>
<div><br>
</div>
</blockquote>
<div><br>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
mapserver-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/mapserver-users">https://lists.osgeo.org/mailman/listinfo/mapserver-users</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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