[mapserver-users] Change Background Image Color Dynamically

[Bill Thoen]

I've got a layer of USGS DRG's where I set the OFFSITE parameter to 
black to hide the excess bitmap at the edges of the DRGs. But this also 
makes black lines , text and other black graphic elements IN the map as 
transparent, washing them out. So I set IMAGECOLOR to black to sharpen 
them up.

However, at scales beyond those appropriate for the DRGs I want to set 
the background color back to white. So is there some way that I can 
either use a black background only when the DRG layer is visible, or 
dynamically change the background color as the map scale changes?


TIA,

- Bill Thoen
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