Hi,
For ages I have been doing the screen-grab using
Apple +
Shift +
3 (OR)
4 which saves a png image to my desktop, then drag it into photoshop. But if I had to screen-grab loads of images, I ended up having a very untidy/cluttered desktop!!

But just found out pressing the combination
Apple +
CTRL +
Shift +
3 (OR)
4 actually copies it to the scrapbook. Allowing a strait forward copy and paste direct into photoshop, and a tidy desktop.

Probably of no interest, but just incase you wanted to know!!
grafxflow_admin