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

[Philippe Ghesquiere]

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?
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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