Change the screenshots file format…

To change the file type that OS X outputs when using the command + shift + 3 or command + shift + 4 (with or without the spacebar after) in Tiger launch Terminal, and depending on what file type you want outputted, type the appropriate line below followed by return:

defaults write type pdf
defaults write type png
defaults write type jpg
defaults write type tif

Quit Terminal. One caveat: You must restart your computer for the change to take effect right away. To revert to the default png format, type:

defaults write type png

as shown above, or delete the plist file in your user preferences folder (again, you need to restart). You can test out different formats, just remember to restart your computer when you are done or after each test.

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