Screenshots of Quick Look windows in Leopard are themselves transparent
One thing I find incredibly neat is that screenshots I’ve taken of Quick Look windows in Leopard are actually transparent — I can layer them on top of other graphics in applications such as Keynote, and the backgrounds show through.
I’m sure this sort of thing happened if you took screenshots of transparent windows in Tiger, but I never bothered. The windows weren’t everywhere. Quick Look is everywhere in the Finder, and as a Big New Feature With A Marketing Name, having screenshots when you’re explaining it to others is really handy.
For reference, I’m using a Python script to take the screenshots. It’s basically calling the built-in screencapture tool and then adding a drop shadow to it with the Python Core Graphics bindings. I got the script from Lankhmart on the Mac OS X Hints forums — I found it after trying to write my own, since I’d been wanting such a script for a long time.