change colors of raster images in mapfile

[Frank Rittinger]

Hello list,

I have two b/w raster layers in a mapfile and would like to change the 
foreground color of one of them from black to blue.

If I add class entries to the layers, both layers get displayed in the 
same color.

After reading the raster howto, I got the impression that that's the 
normal behavior because the same color in all images gets the same new 
rgb value. Is this connected to color bands?

Any hints are welcomed,

regards

Frank Rittinger