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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Could DGWIG WMTS profile offer a workaround?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">7.11 Tile File Formats<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Requirement 10: <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">A DGIWG WMTS server SHALL support at least one of the following raster formats for the GetTile operation:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">image/png (Portable Network Graphics)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">image/gif (Graphics Interchange Format) <o:p>
</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> image/jpeg (Joint Photographic Experts Group)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So no need to support all three as in the WMS profile.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">-Jukka Rahkonen-<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>Lähettäjä:</b> MapServer-dev <mapserver-dev-bounces@lists.osgeo.org>
<b>Puolesta </b>Even Rouault<br>
<b>Lähetetty:</b> keskiviikko 13. syyskuuta 2023 20.16<br>
<b>Vastaanottaja:</b> Philippe Ghesquiere <philippe.ghesquiere@airbus.com><br>
<b>Kopio:</b> MapServer Devs <MapServer-dev@lists.osgeo.org><br>
<b>Aihe:</b> Re: [MapServer-dev] Does mapserver support GIF format for WMS / WMTS services?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">Le 11/09/2023 à 09:09, Philippe Ghesquiere a écrit :<o:p></o:p></p>
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<p class="MsoNormal">Hi Even, <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 thought over your answer again during the weekend. You give the right parameters to get a PNG image format; which is fine.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">However, I do need to offer a GIF format support in order to be compliant to the "<i>DGIWG WMS profile"</i> (OGC 09-102r3).<br>
Indeed, requirement #6 says :<o:p></o:p></p>
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<p class="MsoNormal"><i>A DGIWG WMS server shall support the following raster formats for the GetMap operation </i><o:p></o:p></p>
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<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1">
<i>image/png, </i><o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1">
<i>image/gif, </i><o:p></o:p></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo1">
<i>image/jpeg</i><o:p></o:p></li></ul>
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<p class="MsoNormal">Do you have any other advice / ideas?<o:p></o:p></p>
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<p>- Tell DGIWG folks that the world has moved since the 90's and they should consider moving on ;-)<o:p></o:p></p>
<p>- add middleware between client and mapserver to request png8 to mapserver and convert it back to gif in the middleware<o:p></o:p></p>
<p>- probably easier: enhance mapserver to add back gif support<o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">Sincerely<o:p></o:p></p>
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<p class="MsoNormal">Philippe<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><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 Fri, Sep 8, 2023 at 4:02 PM Philippe Ghesquiere <<a href="mailto:philippe.ghesquiere@airbus.com">philippe.ghesquiere@airbus.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Thanks Even & Seth, <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 will give it a try<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 Fri, Sep 8, 2023 at 3:02 PM Seth G <<a href="mailto:sethg@geographika.co.uk" target="_blank">sethg@geographika.co.uk</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">I think `WITH_GIF` is only used to read in GIF images (for symbols etc.)?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As Even wrote GDAL/GIF doesn't seem to work as an OUTPUTFORMAT. I get:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">msDrawMap(): Image handling error. Failed to draw layer named 'countries'. msOGRFileNextShape(): OGR error. OGR GetNextFeature() error'd. Check logs</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--<o:p></o:p></p>
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<p class="MsoNormal">web:<a href="https://geographika.net/" target="_blank">https://geographika.net</a> & <a href="https://mapserverstudio.net/" target="_blank">https://mapserverstudio.net</a><o:p></o:p></p>
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<p class="MsoNormal">twitter: @geographika<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 Fri, Sep 8, 2023, at 2:43 PM, Even Rouault wrote:<o:p></o:p></p>
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<p>Philippe,<o:p></o:p></p>
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<p class="MsoNormal">Le 08/09/2023 à 14:16, Philippe Ghesquiere via MapServer-dev a écrit :<o:p></o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal">I am a little bit confused with GIF support for WMS/WMTS services.<o:p></o:p></p>
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<p class="MsoNormal">In several parts of the documentation, it is mentioned that GIF support is discarded with the end of the "GD library" support.<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 noticed the compilation option in CMakelists.txt :<o:p></o:p></p>
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<p class="MsoNormal">option(WITH_GIF "Enable GIF support (for PIXMAP loading)" ON)<o:p></o:p></p>
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<p class="MsoNormal">I do not understand the "for PIXMAP loading" comment.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Anyway, our mapserver does not server WMS/WMTS tiles in GIF format.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So here are my few questions :<o:p></o:p></p>
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<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo2">
is GIF support enabled by default for WMS/WMTS services ?<o:p></o:p></li></ul>
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<p class="MsoNormal">no<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l3 level1 lfo3">
do I need to add the option : -DWITH_GIF=ON for cmake configuration ?<o:p></o:p></li></ul>
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<p class="MsoNormal">only to load raster symbols in GIF format<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<ul type="disc">
<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo4">
do I need to add a specific mapserver configuration, like :<o:p></o:p></li></ul>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
OUTPUTFORMAT<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
NAME "GIF"<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
DRIVER GDAL/GIF<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
MIMETYPE "image/GIF"<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
IMAGEMODE RGB<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
EXTENSION "gif"<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt">
END<o:p></o:p></p>
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</blockquote>
<p>I don't think that will work. The GDAL GIF driver already expects paletted data, not RGB. And I don't think switching IMAGEMODE to PC256 would work since that support has effectively gone.<o:p></o:p></p>
<p>I believe the only option to get paletted data is to use PNG8 with the AGG/PNG8 driver and MIMETYPE="image/png; mode=8bit"<o:p></o:p></p>
<p>Even<o:p></o:p></p>
<p><o:p> </o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<div>
<p class="MsoNormal">Thanks for your help and advices<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal">Philippe<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:7.0pt">The information in this e-mail is confidential. The contents may not be disclosed or used by anyone other than the addressee. Access to this e-mail by anyone else is unauthorised.<br>
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<pre>-- <o:p></o:p></pre>
<pre><a href="http://www.spatialys.com/">http://www.spatialys.com</a><o:p></o:p></pre>
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