I've also seen issues with GeoServer potentially losing the right-most and
bottom-most pixels when using rendering transformations to style raster
data.  I've reproduced this in 2.9.x and 2.10.x with GeoTIFF coverages and
with raster-to-raster and raster-to-vector transformations.  This can create
noticeable artifacts when using tiling.

The data appears to be getting lost from a Crop operation and I think that
it is when CoverageCrop is called in
org.geotools.renderer.lite.RenderingTransformationHelper but I haven't had a
chance to do more testing yet.

Steve Ikeoka



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