ImageMosaic layer reprojected with GeoWebCache - Bad image quality
I have a GeoServer 2.1.0 installed on a server.
I have setup some Image Mosaic layers on this GeoServer based on some groups of GeoTiff files in their original projection (for example EPSG:29902 for Ireland or EPSG:28992 for the Netherlands).
These layers have a good image display quality when I visualize them in WMS with the integrated OpenLayers component in their original projection.
I have then seeded this layer with GeoWebCache in EPSG:900913 projection (in order to integrate these layers in Google Maps API). When I visualize the result of this seeded layer in GeoWebCache integrated OpenLayers, the images have a worse display quality.
Does this quality degradation come from the tiled cache creation or from the reprojection ?
Is there a parameter to change to get a better image quality in the reprojected cache ?
I have tried to change the WMS compression parameters in GeoServer to 0 (no compression), it doesn't seem to change anything.
I have also tried to query the cache in different image formats (JPEG, GIF, PNG, ...), the problem seems to appear in every image format.