[gdal-dev] Reprojecting orthoimages and transparent borders

[Neumann, Andreas]

Hi, 

When reprojecting RGB orthoimages with gdalwarp from one projection
system into another, there is often rotation involved and thus there
will be black pixels around the borders. My target format is TIFF with
JPEG compression. 

Is there a way to tell gdalwarp to set these nodata pixels transparent? 

I tried using -dstalpha but gdalwarp tells me this is incompatible with
"-co PHOTOMETRIC=YCBCR", becauses this only supports 3 bands. 

Thank you if you have any idea if there is some setting for RGB Geotiff
files to set nodata pixels to transparent. 

Andreas

  
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