[mapserver-users] OUTPUTFORMAT png 16-bits

[Johannes Paul]

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
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