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Creating transparent image overlay [message #392]

Wed, 25 March 1992 06:28

fireman
Messages: 49
Registered: August 1991

Member

Hi, IDL Users -

I'm looking for a way to make a transparent image overlay _without_
having to go through the slow process of combining images. I've been through
all the graphics functions. What I want is to show DST where SRC is 0, and SRC
otherwise, where DST is what's already displayed and SRC is the image overlay.

I could easily use the WHERE function to create a new, combined image,
then display that, but it's pretty slow. Any ideas?

Thanks,

Gwyn Fireman (Unix novice) phone: (301) 794-1560
Computer Sciences Corporation span: IUEGTC::FIREMAN
IUE Observatory internet: fireman@iue.gsfc.nasa.gov

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