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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I created a .map file that only referenced a single layer - a Shapefile from the local disk (of US States from the Census) and used mapserv.exe –nh and the query
string you list below. The issue with it producing an invalid PNG occurs with that as well. The resulting PNG has the same issue of the 0a (or 10 in decimal) in the header having been converted to 0d 0a (or 13 10 in decimal).
<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"> Steve Lime <<a href="mailto:sdlime@gmail.com">sdlime@gmail.com</a>>
<br>
<b>Sent:</b> Monday, November 22, 2021 10:17 AM<br>
<b>To:</b> John Huotari <<a href="mailto:John.Huotari@RCIS.com">John.Huotari@RCIS.com</a>><br>
<b>Cc:</b> <a href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><br>
<b>Subject:</b> [EXTERNAL] Re: Re: [mapserver-users] Corrupted PNG issue<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">John: What happens if you take WMS out of the equation, so:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> mapserv.exe -nh "QUERY_STRING= map=dynamic\5708d96b-c606-4c35-95e7-085fedc1dcce.map&mode=map" > test.png<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--Steve<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, Nov 19, 2021 at 1:01 PM John Huotari <<a href="mailto:John.Huotari@rcis.com">John.Huotari@rcis.com</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">Thanks for the feedback Jukka, Steve, and Seth.
</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">Using mapserv.exe –nh at the command line produces the same corrupt PNGs as I get through a web server.</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">Using MapServer 7.7.0dev from MS4W as Jukka suggested produces good PNGs, so that’s a viable alternative
for me.</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">I’ve done some playing around with different versions available from GISInternals and it appears that
PNG images generate fine up through their GDAL 3.2.1 and MapServer 7.6.2 version (release-1900-x64-gdal-3-2-1-mapserver-7-6-2), but started producing corrupt PNGs in their GDAL 3.2.2 and MapServer 7.6.2 version (release-1928-x64-gdal-3-2-2-mapserver-7-6-2).</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">If anyone with Windows wants to attempt to reproduce, the older GISInternals versions are available
here: <a href="https://urldefense.com/v3/__https:/www.gisinternals.com/archive.php__;!!G6MNE2S8Nw!yKVpnWeQRQpd5FXwJvsTNO7IpTuIOVg8QYRG9-p9lWYqqKFewNS1eLtiavz38L7P$" target="_blank">
https://www.gisinternals.com/archive.php</a></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>
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