Paul Moen wrote:
Does anyone know how to take a tiff and apply jpeg compression without
messing up the nodata areas? For example, I have a tif with weather radar
imagery in colors black is the nodata color. I want to compress the tif
using jpeg compression, but the compression causes some of the nodata colors
to become something other than black. Is there a way to tell gdal to
consider the black areas no data and do not use them in the compression
process?
gdal_translate -a_srs "epsg:2266" -co "COMPRESS=JPEG" 40.tif 40n.tif
Paul,
No, I am not aware of any approach to doing this. Generally speaking
preserving nodata regions via nodata values when using lossy compression
formats is a big pain, verging on impossible.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, [EMAIL PROTECTED]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | President OSGF, http://osgeo.org
