Hi,

I have several raster-layers with topo-data of different scales that I 
am bundeling within a Layer Group. Via SLDs Layers get shown/hidden 
using Min/MaxScaleDenominators. I have used this technique for years but 
somehow now the images within the Layer Group are distorted while the 
individual Layers look ok.

Individual Layer: http://tinyurl.com/pul8cd9
Layer Group: http://tinyurl.com/m96ctmz

I tried various knobs: PNG options, using JPEG, interpolations, opaque 
but to no avail.

Context: GeoServer 2.6.1 on Ubuntu 13.10, Oracle Java 1.7.0_65-b17 
64bit, Native JAI/ImageIO, interpolation bilinear, PNGJ, Layers: Image 
Mosaic from JPEG-encoded GeoTIFFs. SLDs: http://tinyurl.com/on243wu.

I suspect an issue with transparency for the Layer Group. Thanks for any 
hints or help.

Best,

--Just

Just van den Broecke
www.justobjects.nl







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