[mapserver-users] OUTPUTFORMAT png 16-bits

[Johannes Paul]

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.rahkonen at 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-bounces at lists.osgeo.org> *Puolesta
> *Johannes Paul
> *Lähetetty:* keskiviikko 5. helmikuuta 2020 12.03
> *Vastaanottaja:* mapserver-users at 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
>
>
>
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