[udig-devel] transparency

[Graham Davis <gdavis@xxxxxxxxxxxxxxx>]

Hi all,

I have a question about applying a transparency to a layer or coverage.  
Basically I've developed a tool for geo-referencing an image onto a map 
and warping it to match the map's CRS.  The process for warping the 
image is to create a GridCoverage of the image from a derived CRS using 
a transform, then use the Operations.resample() method to get the result 
as a warped coverage.  The result is the image warped to fit the CRS of 
the map.  My problem is that the edges of the result where it was 
rotated are black.

I'm trying to figure out the best way to make these black areas 
transparent.  Is there a setting that can achieve this when I do the 
actual resampling?  Or do I need to apply some sort of style/setting on 
the resulting coverage afterwards?  I don't know how to achieve either 
or if there is another, better way.  Can someone point me in the right 
direction?  Thanks,

--
Graham Davis
Refractions Research Inc.
gdavis@xxxxxxxxxxxxxxx