Hello Johannes, 16bit-PNGs are IMHO not supported by MapServer. Although libPNG supports 16bit depth (see http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4.3) MapServer only supports 1, 2, 4 and 8bit palettes (see https://github.com/mapserver/mapserver/blob/master/mapimageio.c#L355).
HTH -----Ursprüngliche Nachricht----- Von: mapserver-users [mailto:mapserver-users-boun...@lists.osgeo.org] Im Auftrag von Johannes Paul Gesendet: Mittwoch, 5. Februar 2020 11:33 An: Rahkonen Jukka (MML) Cc: mapserver-users@lists.osgeo.org Betreff: Re: [mapserver-users] OUTPUTFORMAT png 16-bits Hello Jukka, Thanks for your reply, i've changed mimetype but i still get the 8-bits png... Johannes Le mer. 5 févr. 2020 à 11:09, Rahkonen Jukka (MML) <jukka.rahko...@maanmittauslaitos.fi> a écrit : Hi, I would make a test by using some other mimetype, like image/png16, for eliminating the possibility that some internal png configuration drives over your own outputformat. I don’t know if it helps but it is cheap to test. -Jukka Rahkonen- Lähettäjä: mapserver-users <mapserver-users-boun...@lists.osgeo.org> Puolesta Johannes Paul Lähetetty: keskiviikko 5. helmikuuta 2020 12.03 Vastaanottaja: mapserver-users@lists.osgeo.org Aihe: [mapserver-users] OUTPUTFORMAT png 16-bits Hello, I'm using Mapserver to output PNG 16-bits DEM raster from .HGT elevation data. I'm using the below output format definition : OUTPUTFORMAT NAME PNG16 DRIVER GDAL/PNG MIMETYPE image/png IMAGEMODE INT16 EXTENSION "png" END However I keep on getting the standard PNG 8-bits out of mapserver. The strange thing being that when I use a similar config to get GeoTiff 16-bits, I do get what I'm asking for : OUTPUTFORMAT NAME GEOTIFF16 DRIVER GDAL/GTiff MIMETYPE image/tiff IMAGEMODE INT16 EXTENSION "tiff" END Could that be an issue with the GDAL/PNG driver ? It seems that the GDAL/PNG driver supports only CreateCopy() and not Create(), where the GDAL/GTiff driver supports both ... Could that be it ? I suspect the GDAL/PNG driver so I also sent my issue to the GDAL mailing list. I can see from the mailing list that other users already had a similar issue, but there is no obvious reason or solution provided. https://lists.osgeo.org/pipermail/mapserver-users/2011-April/068428.html https://lists.osgeo.org/pipermail/mapserver-users/2012-January/071310.html For information, I'm using GDAL v2.1.3 and Mapserver v7.0.1 Thanks, Johannes _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users
