Le 11/09/2023 à 09:09, Philippe Ghesquiere a écrit :
Hi Even,
I thought over your answer again during the weekend. You give the
right parameters to get a PNG image format; which is fine.
However, I do need to offer a GIF format support in order to be
compliant to the "/DGIWG WMS profile"/ (OGC 09-102r3).
Indeed, requirement #6 says :
/A DGIWG WMS server shall support the following raster formats for
the GetMap operation /
* /image/png, /
* /image/gif, /
* /image/jpeg/
Do you have any other advice / ideas?
- Tell DGIWG folks that the world has moved since the 90's and they
should consider moving on ;-)
- add middleware between client and mapserver to request png8 to
mapserver and convert it back to gif in the middleware
- probably easier: enhance mapserver to add back gif support
Sincerely
Philippe
On Fri, Sep 8, 2023 at 4:02 PM Philippe Ghesquiere
<[email protected]> wrote:
Thanks Even & Seth,
I will give it a try
On Fri, Sep 8, 2023 at 3:02 PM Seth G <[email protected]> wrote:
I think `WITH_GIF` is only used to read in GIF images (for
symbols etc.)?
As Even wrote GDAL/GIF doesn't seem to work as an
OUTPUTFORMAT. I get:
msDrawMap(): Image handling error. Failed to draw layer named
'countries'. msOGRFileNextShape(): OGR error. OGR
GetNextFeature() error'd. Check logs
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On Fri, Sep 8, 2023, at 2:43 PM, Even Rouault wrote:
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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