[Geotiff] Setting transparency in GeoTIFFs

[Gordon Keith]

Is there a simple way of setting the background to transparent with GeoTIFFs.

I've been looking for a way of setting background to transparent with 
GeoTIFFs. The ImageMagick convert program can set a transparency mask for 
normal TIFFs, but is not GeoTIFF aware. At the moment I am doing the 
following:

        listgeo $MAPNAME.tif > $MAPNAME.geo
        convert -transparent white -depth 8 $MAPNAME.tif trans_$MAPNAME.tif
        geotifcp -c lzw -g $MAPNAME.geo trans_$MAPNAME.tif $MAPNAME.tif

which works OK, but is a little messy.

Is there are cleaner method of doing this?

Regards
Gordon

-- 

Gordon Keith
Programmer/Data Analyst
Marine Acoustics
CSIRO Marine and Atmospheric Research
http://www.cmar.csiro.au

Outgoing mail is certified Virus Free.
Checked by Trust-Me Virus.