How do I change the format of a Mac screen capture?
About 6 months ago I was playing around on my iBook G4 and I found the option to change the format that Apple+Shift+4 saves in. For some odd reason I choose JPG-2000 (picture.jp2). Of course, now I can't find how to change it back!
It's not hard to change the format of a screen capture / screenshot made with the native Mac OS X capture utility, but you do have to be comfortable opening up your Terminal.app and typing in a command on the command line. Y'know, the Unix underneath the snazzy graphical interface. :-)
Start by going to Applications --> Utilities --> Terminal.app and launching it. You'll see something like this:
At this point you want to decide which format you'd like. Here are your choices:
Pick the one you like -- I recommend PNG, which stands for progressive network graphic, as the best of both GIF and JPEG formats -- and then type in the following command exactly as shown:
defaults write com.apple.screencapture type image_format
For example, if you did decide to use PNG format, you'd type:
defaults write com.apple.screencapture type png
Type that in and you won't see anything change, but next time you take a screen shot (as documented here: how to get a screen capture on Mac OS X) you'll have the image saved in the format you seek.
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