Secret screenshot tips

I take a lot of screenshots while documenting my products. I used to use Ambrosia's Snapz Pro, but it started misbehaving (losing its hotkey), so I stopped. Nowadays, I find Apple's built-in screenshot tools quite adequate.

Firstly, of course, is the Grab application, located in your /Applications/Utilities folder. I only tend to use that when I need a timed screenshot, e.g. to record partway through an animation. It is quite useful for that, though: you activate the timed screenshot function, wait for the timer to run out, and it takes a shot of the whole screen in whatever state it is then. It can take a few attempts to get the precise animation frame I want, but it allows taking a shot while clicking and dragging, something the built-in screenshots can't. That was admittedly one of the strengths of Snapz Pro, too.

Built into the OS is the whole-screen screenshot hotkey, Shift-Cmd-3. This will save a PNG image of the whole screen (or multiple pictures if you have multiple screens) to the Desktop. (You can change the file format via a utility like Secrets if you wish. You can also change the hotkey via the Keyboard & Mouse system preferences.)

Perhaps slightly less well known is Control-Shift-Cmd-3, which saves the screenshot onto the Clipboard. Very handy for pasting into emails and such.

The one I find most useful is Shift-Cmd-4, though. This displays crosshairs with a coordinate display, and when you click-and-drag out a selection, the coordinates change to the selection size. Very handy. This saves the selected area to a PNG file.

Similarly, Control-Shift-Cmd-4 saves a selected region to the Clipboard.

These selection screenshot options are even more flexible than that, though. After invoking them, but before dragging a selection, you can press the Spacebar to highlight the window under the crosshairs. Clicking will then take a shot of that window, including the border.

While dragging a selection, there are more options. You can hold the Shift (Shift) key to constrain one axis — to keep the height the same while adjusting the width, or vice versa.

You can also hold the Option (Option) key to adjust the size around the center point, instead of from the point where you started dragging.

And you can hold the Spacebar in selection mode to reposition the whole selection, keeping the size the same. Very handy.

Finally, you can cancel the screenshot simply by pressing Escape. This can be useful on occasions other than just changing your mind: you can use the screenshot tool as a ruler, measuring the number of pixels of an object by dragging out a selection and reading the size display from the crosshairs, then hit Escape to exit without taking a shot.

Very useful. If anyone knows of any other tricks with the screenshot tools, please let me know!