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Change the screenshot file type Desktop
Apple's Cocoa Development mailing list archives contain an interesting snippet that explains how to change the default screenshot (command-shift-3 and -4) format from TIFF to JPEG, PICT or PNG. The original article can be seen here (read the dialog box for the username and password), but it's basically a one-line terminal command:
defaults write NSGlobalDomain AppleScreenShotFormat imageFormat
Replace imageFormat with one of JPEG, TIFF, PNG, or PICT to change the format of the screenshot.

This can also easily be done using a prefpane known as OrangePref from Freshly Squeezed Software. The pane also allows you to set the scroll bar arrow behaviour (just like the TinkerTool prefpane).

[Editor's note: Of course, there are also third-party screenshot programs that offer even more choices - SnapzPro X, for example, can save images as .bmp, .gif, .psd, and probably a couple others I'm forgetting at the moment.]
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PNG format is the smallest file size
Authored by: tomhackett on Dec 24, '01 05:00:16AM

I found that the PNG format produces the smallest file size at about 250K.

The biggest file sizes are made using the PICT format 1.5 MB. JPEF and TIFF don't seem to use compression because they end up at about 800K in size.

These are of course just a quick test and perhaps further testing would provide better understanding of which is best and why, but for now I'm using PNG because it seems the most efficient.

- Tom Hackett

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PNG format is the smallest file size
Authored by: qwerty denzel on May 20, '05 02:39:21AM

PICT files are uncompressed. Therefore the JPEG and TIFF files are compressed (since they're smaller).

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Changing screenshot file format
Authored by: baltwo on Sep 17, '02 03:52:43AM

This worked in X 10.1, but although it changes the defaults, it doesn't keep JAG from making all screenshots in PDF format. The new TinkerTool for JAG has the option to change the format greyed out. So how do we change the format type for screenshots in JAG?

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10.4 - Does this still hold true?
Authored by: legacyb4 on May 19, '05 10:10:18PM

Does this still hold true for Tiger?

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