We have a directory of JP2 imagery with 4 bands, the standard RGB plus NIR.
When I create an ImageMosaic layer from that directory and do a WMS GetMap on
that layer with TRANSPARENT=false and PNG format, I get a PNG image with an
alpha band. From the OGC's WMS 1.1.1 specification I would assume that I should
only get the RGB bands when I specify TRANSPARENT=false.
If I define a 3-band SLD that specifies the RGB channels (bands) I want, I will
get an RGB image without alpha channel when I specify TRANSPARENT=false. So one
would say that I should just use that SLD as the default for the layer.
However, that creates problems when I specify a second layer with just 3 bands
in an appropriate GetMap request. The GetMap request has a bounding box such
that the 4-band layer covers only the left half, and the 3-band layer appears
in the right half. This works fine when no SLD (i.e. just the default raster
SLD) is involved, and the resulting image has only 3 bands. However, when the
above 3-band SLD is active for the 4-band layer, the right half of the returned
image is transparent instead of showing the 3-band layer.
So I am wondering what I can do to get consistent 3-band output from GeoServer,
especially when I have a mix of 3-band and 4-band imagery?
Thanks, Felix
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