When did the restriction, "the Reference Map base image must be a .gif", start being enforced?
I now see it in my old printed copy (version 5.2) of the documentation. I checked there to see if this was new to MapServer version 6 as I found it first in the online documentation. Obviously I had never read the documentation closely in this area. All my reference maps are "png" drawn with Mapserver (aggpng I think) and work in version 5.6. When my try/catch throws an exception trying to draw this reference map, the exception message is an empty string. Through testing and looking at the apache logs, I find that there are MapServer Errors in the MapServer errorObj and PHP Notices and Warning. These are: [Mapserver Error] msDrawREferenceMap() : error loading reference image /data/mapfiles/ref_maps/. [MapServer Error] readImage(): unsupported pixmap format/n in . Is this truly a change in the image type restriction for Reference Maps or is it just an change in the checking for errors when the MapScriptException was added? Was I just lucky my ".png" reference maps worked in the past? Am I the only one to try this? I don't have many to convert but wanted to point this out so it could be added to the Migration Guide if it must remain a restriction.
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