BB,

Allow me to hyjack the thread for a moment.

Re GC... why (often) when I am using IDL with GC enabled do the colors appear washed out? When I turn GC off, the colors are deep and vivid. Am I underlit and GC is dragging things up to normal or is there something more fundimental going on.

Asked another way, is GC to video what an automatic gain control is the audio? Or is it something quite different? (Which, obviously, I'd like you to explain!) :)

D.