Hi all,
I have my WMS service and raster layers configured use bilinear resampling.
While these layers look perfect on their own, when added to a layer group,
GeoServer seems to fall back to nearest neighbour resampling making the image
quality worse. I’ve noticed this behaviour whenever there’s more than one layer
in a layer group as a layer group containing only a single a single layer
appears fine.
I’ve found the issue has already been reported on the mailing list by someone
else as affecting GeoServer v2.1. I’m using 2.6.2 so obviously the issue has
yet to be addressed. The existing issue can be found here:
http://sourceforge.net/p/geoserver/mailman/message/27750315/
Here is a link which includes an example of a layer group with a single layer
(same as viewing the layer on it’s own) and another showing the layer group
with multiple layers:
https://drive.google.com/folderview?id=0B0QYHTaybWU_fjF5SEtCSDZvOU1PRzVCb3J1dFBiWUloYnJCUDRua201ZGZweGtrTnUtb3c&usp=sharing
The issue linked above mentioned that in GeoServer 2.1 the raster rendering
code paths were split; one is server in image server mode, and the other in map
server mode, which is likely the cause of this.
This really needs to be fixed.
Cheers,
Tom
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