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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So you really do need 24-bit output. I was looking back through the mailing list archives and it was mentioned back in 2012 that aliased output could be implemented
for simple (1 pixel-wide) lines and polygons – so there is hope but I don’t believe (looking through the source) that Thomas ever fully implemented it. In mapagg.cpp there are ifdef’s for a symbol named AGG_ALIASED_ENABLED which makes me wonder if work was
started. I tried setting that in mapagg.cpp but ran into compile errors and didn’t try and track those down.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Of course you’d have to live with 1 pixel wide lines…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Erik H [mailto:erik.h11.01@gmail.com]
<br>
<b>Sent:</b> Monday, October 16, 2017 1:15 PM<br>
<b>To:</b> Lime, Steve D (MNIT) <steve.lime@state.mn.us><br>
<b>Cc:</b> mapserver-users@lists.osgeo.org<br>
<b>Subject:</b> Re: [mapserver-users] Draw roads WITHOUT anti-aliasing<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks for your reply, but I should have mentioned that I have a LOT of different colors to be displayed, almost a million...<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I should also have mentioned that I've already tried to filter out the anti-aliased pixels by setting all alpha bytes to 255 and then assuming that all pixels that don't have alpha=255 in the PNG can be removed, but that assumption seems
to be wrong.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Oct 16, 2017 at 2:00 PM, Lime, Steve D (MNIT) <<a href="mailto:steve.lime@state.mn.us" target="_blank">steve.lime@state.mn.us</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hmmm… I wonder if you just could use a pre-computed palette to control quantizing to 8 bits. You can
supply a palette file (RGB or RGBA) and the MapServer will map 24/32-bit values to those in the palette. Format options are:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> FORMATOPTION "PALETTE_FORCE=TRUE"</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> FORMATOPTION "PALETTE=palette.txt"</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This will definitely limit the colors in your output image to those you specify. The question is whether
or not the anti-aliased colors will map to the right color and that will depend on your palette. I did write a simple test with a 5 color palette (black, white, red, green and blue) and it seems to work ok but that’s a very simple palette… Based on your application
it might work though.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="m1532385765130021136msolistparagraph" style="margin-left:24.75pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-</span><span style="font-size:7.0pt;color:#1F497D">
</span><a href="http://maps1.dnr.state.mn.us/cgi-bin/mapserv70?map=/usr/local/mapserver/apps/test/palette/test.map&mode=map" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">http://maps1.dnr.state.mn.us/cgi-bin/mapserv70?map=/usr/local/mapserver/apps/test/palette/test.map&mode=map</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
(24-bit)</span><o:p></o:p></p>
<p class="m1532385765130021136msolistparagraph" style="margin-left:24.75pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-</span><span style="font-size:7.0pt;color:#1F497D">
</span><a href="http://maps1.dnr.state.mn.us/cgi-bin/mapserv70?map=/usr/local/mapserver/apps/test/palette/test.map&mode=map&map.imagetype=png8" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">http://maps1.dnr.state.mn.us/cgi-bin/mapserv70?map=/usr/local/mapserver/apps/test/palette/test.map&mode=map&map.imagetype=png8</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
(8-bit w/5 colors)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Steve</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> mapserver-users [mailto:</span><a href="mailto:mapserver-users-bounces@lists.osgeo.org" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mapserver-users-bounces@lists.osgeo.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">]
<b>On Behalf Of </b>Erik H<br>
<b>Sent:</b> Monday, October 16, 2017 10:58 AM<br>
<b>To:</b> </span><a href="mailto:mapserver-users@lists.osgeo.org" target="_blank"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">mapserver-users@lists.osgeo.org</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><br>
<b>Subject:</b> [mapserver-users] Draw roads WITHOUT anti-aliasing</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm running a tiling server that uses MapServer 7.0.4 to generate PNGs.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">My colleagues came up with an ingenious idea to animate traffic conditions that would require them to identify road segments based on their color. They asked me to generate tiles
with a predetermined RGBA value per road segment. <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I configured a layer of type LINE, with a STYLE section containing 'COLOR [palette]' (palette being a field in the database query). Initially, I thought I was creating the images
my colleagues needed, but it seems that the anti-aliasing causes some pixels to have colors other than the one I specified; this prevents us from identifying the road segments.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We can live without anti-aliasing, but I was unable to turn it off; I tried both the AGG/PNG and GD/PNG drivers and messed with various FORMATOPTION identifiers, but nothing seemed
to make any difference.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Any suggestions?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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