There are many ways to take a screenshot in Mac OS X. You have the following built in options:
By pressing
Command (aka Apple) + SHIFT + 3" you can take a picture of everything
on your screen.
Command + SHIFT + 4" - brings up crosshairs as the mouse pointer.
With this you can click and drag over what is on the screen that you want to take as a picture.
Release the mouse button and the picture is taken. For extra fun: Press space bar while you have
the crosshairs and you will be able to select windows, icons, desktops, menus, menu bars, docks,
etc.
The pictures will be sent to your desktop as
"Picture 1.pdf",
"Picture 2.pdf", etc. etc... Then you can use Photoshop, Graphic
Converter, etc. to convert it to other formats besides PDF (PNG or JPEG are best for uploading to
DSLR).
There are some other applications such as
SnapNDrag, which is a freeware, and
Snapz Pro, which is sold. They have better features - higher quality shots, the
ability to record movies, the ability to change formats in which the pictures are saved, and of
course you can add the drop shadow.
Note: With 10.4 (Tiger) Apple has changed the default
format produced by Command-SHIFT-3/4 from PDF to PNG.
