[gdal-dev] Masking issue

[Oyvind Idland]

Hello,


I got one problem: I have a bunch of uncompressed TIFF tiles, which I am
converting to compressed GeoTiff. I would
like to mask away the rgb(0,0,0) values.

However, when I use NODATA on my VRT dataset, there are JPEG artifacts
around the edges when rendering.

Is it possible to generate a transparency mask based on NDATA before
compressing, or is there any other/better way of
doing this ?

thanks,

- oyvind
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