glass effect - CG call to do this?

FROM : John Clayton
DATE : Thu May 15 11:01:30 2008

Hi

A few months ago, while browsing code headers at random (lets just 
call this a little passtime of mine), I noticed a method call that 
took an image and then added a glass effect to it.

I believe this was in the Core Graphics headers somewhere, but for the 
life of me can't find it now.

Does anyone know if this exists and where it might be? (don't tell me 
I was just dreaming).

Cheers,
--
John Clayton
http://www.coderage-software.com/