<!DOCTYPE html><html><head><title></title><style type="text/css">#qt p.qt-MsoNormal{margin-top:0in;margin-right:0in;margin-left:0in;margin-bottom:0.0001pt;font-size:11pt;font-family:"Calibri", sans-serif;}
#qt a:link{color:blue;text-decoration-line:underline;text-decoration-style:solid;text-decoration-color:currentcolor;text-decoration-thickness:auto;}
p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><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">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:http://geographika.co.uk<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 <mapserver-users-bounces@lists.osgeo.org> on behalf of Richard Greenwood <richard.greenwood@gmail.com><br> <b>Date: </b>Tuesday, May 18, 2021 at 11:50 AM<br> <b>To: </b>"mapserver-users@lists.osgeo.org" <mapserver-users@lists.osgeo.org><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"> 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">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">mapserver-users@lists.osgeo.org</a><br></div><div><a href="https://lists.osgeo.org/mailman/listinfo/mapserver-users">https://lists.osgeo.org/mailman/listinfo/mapserver-users</a><br></div><div><br></div></blockquote><div><br></div></body></html>