Philippe,
Le 08/09/2023 à 14:16, Philippe Ghesquiere via MapServer-dev a écrit :
Hi all,
I am a little bit confused with GIF support for WMS/WMTS services.
In several parts of the documentation, it is mentioned that GIF
support is discarded with the end of the "GD library" support.
I noticed the compilation option in CMakelists.txt :
option(WITH_GIF "Enable GIF support (for PIXMAP loading)" ON)
I do not understand the "for PIXMAP loading" comment.
Anyway, our mapserver does not server WMS/WMTS tiles in GIF format.
So here are my few questions :
* is GIF support enabled by default for WMS/WMTS services ?
no
* do I need to add the option : -DWITH_GIF=ON for cmake configuration ?
only to load raster symbols in GIF format
* do I need to add a specific mapserver configuration, like :
OUTPUTFORMAT
NAME "GIF"
DRIVER GDAL/GIF
MIMETYPE "image/GIF"
IMAGEMODE RGB
EXTENSION "gif"
END
I don't think that will work. The GDAL GIF driver already expects
paletted data, not RGB. And I don't think switching IMAGEMODE to PC256
would work since that support has effectively gone.
I believe the only option to get paletted data is to use PNG8 with the
AGG/PNG8 driver and MIMETYPE="image/png; mode=8bit"
Even
Thanks for your help and advices
Philippe
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