Raster JPEG Input using OFFSITE

[Randy How]

My question is in regards to using the OFFSITE setting for a JPEG data
source to remove the "black/NoData" areas.  Does it work at all?  I've
attempted this but it made no difference (mapserver 4.7).
 
It will work with Tiff's (that have internal JPEG compression) and poorly
with ECW's due to the variability in "black".
 
Randy
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