[mapserver-users] Set RASTER layer's black background to transparent

[adsaero]

Hi!  I've been searching for a while and can't seem to find an easy answer;  I have a .PNG image that I use as a raster layer to a map.  The .PNG has a black background, and I'd like the black background to actually be transparent on the map, as it sits on top of other layers.
<br><br>I don't have control over the image generation, so I can't set the background to transparent at build time.
<br><br>Anyone have any suggestions as to how I can accomplish this?
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