[gdal-dev] gdalwarp

[MUTLU OZDOGAN]

Dear List

I have a compressed 4-band geotiff image with the 4th band being the Alpha channel.  When I reproject this image to any other projection using gdalwarp or cut a a small window out of it using gdal_translate, all pixel values become 0 although in the original image they are not zeros.  I think this is because the alpha channel is being interpreted as a mask band - how do I turn this off?  I just want to be able to reproject the image and retain pixel values of all 4 bands (including the alpha band) in the new reprojected file.

Thank you.

Mutlu..


--
Mutlu Ozdogan, Ph.D.
Associate Professor
Department of Forest and Wildlife Ecology &
Nelson Institute for Environmental Studies
t: (608) 262-0873
e: ozdogan at wisc.edu<mailto:ozdogan at wisc.edu>




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