serving WMS true color maps

[Frederic Claudel]

I'm using Mapserver to serve RBG satellite images as WMS. They are stored as RGB GeoTIFFs. This proves to be a very efficient solution.
Unfortunately, most of the client applications accessing the data don't allow the user to choose the format, and I end up with 8-bit data beeing displayed.

It looks like you cannot restrict formats available in the WMS GetCapabilities document. You always have image/png, image/gif (I tried with Mapserver 4.4 and 4.7 from FWTools.)
Is there a way around that issue?
I'd like to serve only image/jpeg and maybe image/png;mode=24bits.

I tried to set my layers to opaque (since jpeg doesn't support transparency), but it doesn't help with the clients.
The clients I'd like to use are:
 - Udig 1.0.0 (not beta)
 - ESRI ArcMap 8.3 + OGC plugin

If you can help, it will be most welcome.
thanks,
Frederic Claudel

PS: I actually think the WMS spec needs a way for a client to explicitly ask for an indexed / or truecolor map.




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