[OpenLayers-Users] format parameter of OpenLayers.Layer.ArcGIS93Rest changes from "jpg" to "png".

[Gis Mage]

Hello list,

I'm setting a format parameter of OpenLayers.Layer.ArcGIS93Rest layer as
"jpg".
When a request to ArcGIS Server is fired it contains a &FORMAT=png
parameter, so the returned picture is in png format.
Why is it so and how can I set a strict jpg format?

When I set "gif", "png24" or "png" it acts as normal and both request and
returned picture are in the desired format.

Thanks
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