New answers tagged image-mosaic
The base dataset is in RGB format but the issue is caused when one layer is not visible due to Min/MaxScaleDominator in the SLD. If you check the two layers individually using GDALinfo I believe you will find that the format of the blank tile has been changed by GeoServer and is now RGBA whilst the visible tile is still in the original RGB. We think it is ...
Check if the source data uses paletted colours. You can not reproject them easily, because interpolating paletted colours will fail. Convert the source data to RGB or RGBA, and the interpolation during reprojection will deliver good looking results. Furthermore, check if NODATA value conflicts with any used colour.
I had the same problem, and in my case changing the permissions(write) on the files fixed the problem.
Check this thread, it worked for me https://groups.google.com/forum/#!topic/geoserver-manager-users/sa1D4kRr62A
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