[MapServer-dev] Does mapserver support GIF format for WMS / WMTS services?

Wed Sep 13 11:50:20 PDT 2023

Hi,

Could DGWIG WMTS profile offer a workaround?

7.11 Tile File Formats
Requirement 10:
A DGIWG WMTS server SHALL support at least one of the following raster formats for the GetTile operation:
image/png (Portable Network Graphics)
image/gif (Graphics Interchange Format)
 image/jpeg (Joint Photographic Experts Group)

So no need to support all three as in the WMS profile.

-Jukka Rahkonen-

Lähettäjä: MapServer-dev <mapserver-dev-bounces at lists.osgeo.org> Puolesta Even Rouault
Lähetetty: keskiviikko 13. syyskuuta 2023 20.16
Vastaanottaja: Philippe Ghesquiere <philippe.ghesquiere at airbus.com>
Kopio: MapServer Devs <MapServer-dev at lists.osgeo.org>
Aihe: Re: [MapServer-dev] Does mapserver support GIF format for WMS / WMTS services?

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 <philippe.ghesquiere at airbus.com<mailto:philippe.ghesquiere at airbus.com>> wrote:
Thanks Even & Seth,

I will give it a try

On Fri, Sep 8, 2023 at 3:02 PM Seth G <sethg at geographika.co.uk<mailto:sethg at geographika.co.uk>> 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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