[gdal-dev] gdal_retile and nodata

[acangi]

When creating the level x, gdal_retile interpolates the tiles of level x-1.
If not all data exist in level x-1, it interpolates with nodata values (I
guess ?). The result is that at the border, we can see almost black values,
but not exactly black. They become visible when setting the output
transparent color in GeoServer.

How can I get rid of them ? nearblack can't output GeoTIFFs yet (gdal
1.7.2). 
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