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

Wed Sep 13 23:48:28 PDT 2023

Hi Jukka & Even,

I agree DGIWG profiles are not very consistent. I will live with this
"limitation".
Whenever we get complaints about our WMS formats, I will argue with WMTS
req #10.

Thanks
Philippe

On Wed, Sep 13, 2023 at 8:50 PM Rahkonen Jukka <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> 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> 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> 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
>
>
>
>
>
> --
>
> web:https://geographika.net & https://mapserverstudio.net
>
> twitter: @geographika
>
>
>
> 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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