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Extend Mac OS X's Screenshots

Mac OS X has a variety of built in screenshot methods. Here's a look at a few that offer more versatility than the basic full-screen capture (Command-Shift-3):

• Press Command-Shift-4 and you'll get a crosshair cursor with which you can drag to select and capture a certain area of the screen.

• Press Command-Shift-4-Space to select the entire window that the cursor is over, clicking on the window will then capture it. The resulting screenshot will even get a nice drop shadow.

• Hold down the Space bar after dragging out a selection window to move your selection rectangle around on the screen.

• Hold down Shift after dragging out a selection to constrain the selection in either horizontal or vertical orientation, depending on the direction of your drag.

• Hold down Option after dragging out a selection to expand the selection window around a center point.

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Tip: See Dictionary Definitions in Real Time

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I've just run across a useful little variant in how you can use Mac OS X's built-in dictionary service to see definitions of words in your documents. You undoubtedly know that you can Control-click or right-click any word and choose Look Up in Dictionary to display a little pop-up definition (some applications instead launch the full Dictionary application). And you may know that if you press Command-Control-D, the little dictionary pop-up appears for the word currently under the pointer. But if you press Command-Control-D and keep holding the Command and Control keys down, in either Tiger or Leopard, that little dictionary pop-up stays on screen and changes to define whatever word is under it as you move the pointer around. Try it yourself, or watch my brief screencast demonstrating the feature.

This feature works only in certain Mac OS X-native applications that support Apple's built-in dictionary, so it definitely won't work in Microsoft Word or Eudora, which use their own dictionaries, or in Firefox, which is barely a Macintosh app. However, it does work fine in the current versions of Mail, iChat, TextEdit, Safari, BBEdit, TextWrangler, iCab, NetNewsWire, Skype, Toast, and many others (thanks to folks on TidBITS Talk for testing).

Why might you want to use this trick? If you're editing a document that contains a number of unfamiliar words, it could be a fast way to learn their definitions. Or imagine that you're translating a document into another language, or learning a new language. I'd have been ecstatic to have a feature like this when I was learning Ancient Greek and Latin back in college, since looking up words in a separate dictionary slows down reading significantly.

 

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