<div dir="ltr"><div dir="ltr">On Mon, May 17, 2021 at 7:05 AM Rahkonen Jukka (MML) <<a href="mailto:jukka.rahkonen@maanmittauslaitos.fi">jukka.rahkonen@maanmittauslaitos.fi</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang="FI" style="overflow-wrap: break-word;">
<div class="gmail-m_-3607266712772208501WordSection1">
<p class="MsoNormal"><span>Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span><u></u> </span></p>
<p class="MsoNormal"><span lang="EN-US">Are you sure about “</span><span lang="EN-US">I actually found that 6.4 produced small, aliased images with both the GD and AGG drivers”. </span></p></div></div></blockquote><div><br></div><div>Yes, I just tested again. In 6.4 I get identical (visually and size) images with: </div><div><font face="monospace"> OUTPUTFORMAT</font></div><div><font face="monospace"> DRIVER "AGG/PNG" or "GD/PNG".<br></font></div><div><font face="monospace"> . . .</font></div><div><br></div><div>Interestingly, "GD/PNG" does not throw an error in mapserver 7.6 or main (MapServer 7.7).</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="FI" style="overflow-wrap: break-word;"><div class="gmail-m_-3607266712772208501WordSection1"><p class="MsoNormal"><span lang="EN-US">Or</span><span lang="EN-US">iginally
the AGG library could only do anti-aliasing and that affected also Mapserver 5 <a href="https://lists.osgeo.org/pipermail/mapserver-users/2007-September/025467.html" target="_blank">
https://lists.osgeo.org/pipermail/mapserver-users/2007-September/025467.html</a>.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I guess that Mapnik folks have since that added support for controlling anti-aliasing with gamma setting
<a href="http://mapnik.org/mapnik-reference/" target="_blank">http://mapnik.org/mapnik-reference/</a>.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I can see that gamma can be used also with Mapserver
<a href="https://www.mapserver.org/mapfile/outputformat.html" target="_blank">https://www.mapserver.org/mapfile/outputformat.html</a><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Have a try with gamma=0. However, Even wrote that turning off antialiasing is possible only in master, so perhaps gamma=0 does not work.</span></p></div></div></blockquote><div><br></div><div>I tried </div><div><font face="monospace"> OUTPUTFORMAT</font></div><div><font face="monospace"> FORMATOPTION "GAMMA=0"</font></div><div><font face="monospace"> . . .</font></div><div class="gmail_quote"><br></div>I see no difference in the output image in 7.7 (main) or 7.6 or 6.4. Is my syntax correct?</div><div class="gmail_quote"><br> <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="FI" style="overflow-wrap: break-word;"><div class="gmail-m_-3607266712772208501WordSection1"><p class="MsoNormal"><span lang="EN-US"><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> </span><span lang="EN-US">The documentation for Mapserver 5 tells that “</span><span lang="EN-US">All ANTIALIAS keywords are now ignored". But the keyword still appears in quite a many places:</span></p>
<p class="MsoNormal"><span lang="EN-US"><a href="https://mapserver.org/search.html?q=antialias" target="_blank">https://mapserver.org/search.html?q=antialias</a><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Would it be time to remove them as well as now not useful references to GD renderer (removed by RFC 99 in 2013)?</span></p></div></div></blockquote><div><br></div><div>From my testing it seems that <=6.4 is aliased and >=7.0 is antialiased regardless of ANTIALIAS options.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="FI" style="overflow-wrap: break-word;"><div class="gmail-m_-3607266712772208501WordSection1">
<p class="MsoNormal"><span lang="EN-US">-Jukka Rahkonen-<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">Lähettäjä:</span></b><span lang="EN-US"> mapserver-users <<a href="mailto:mapserver-users-bounces@lists.osgeo.org" target="_blank">mapserver-users-bounces@lists.osgeo.org</a>>
<b>Puolesta </b>Richard Greenwood<br>
<b>Lähetetty:</b> maanantai 17. toukokuuta 2021 15.26<br>
<b>Kopio:</b> <a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<b>Aihe:</b> Re: [mapserver-users] differing image size with different mapserver versions<u></u><u></u></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<div>
<div>
<div>
<p class="MsoNormal">Thanks for the suggestions. The consensus seems to be that anti-aliasing is causing the increased size. The
<a href="https://mapserver.org/output/antialias.html" target="_blank">documentation here</a> says "<i>Since version 6.0, MapServer will produce aliased output for the “gd/” drivers, and antialiased output for the “agg/” and “cairo/” ones</i>" and it's also mentioned
<a href="https://lists.osgeo.org/pipermail/mapserver-users/2012-April/072011.html" target="_blank">
here</a> in Thomas Bonfort's reply. I actually found that 6.4 produced small, aliased images with both the GD and AGG drivers and regardless of my ANTIALIAS true/false setting. <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Would anyone consider re-enabling the ANTIALIAS true/false option?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Rich<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
_______________________________________________<br>
mapserver-users mailing list<br>
<a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<a href="https://lists.osgeo.org/mailman/listinfo/mapserver-users" rel="noreferrer" target="_blank">https://lists.osgeo.org/mailman/listinfo/mapserver-users</a><br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Richard W. Greenwood, PLS<br><a href="http://www.greenwoodmap.com" target="_blank">www.greenwoodmap.com</a></div></div></div>