To change default format for screencap images, in Terminal.app, type:
defaults write com.apple.screencapture type png (or whatever type you want)To change default folder for screencap images, in Terminal.app, type:
defaults write com.apple.screencapture location "/Users/username/Desktop/screecaps" (or whatever location you want)
The Secrets preference pane does, indeed, change the default file type or folder for screen captures generated by the OS X shortcut. The killall command will work, or, as the Secrets pane suggests, a reboot will do the same.The PrefPane 1.0.6 (10.5+) at http://secrets.blacktree.com/ won't help since can only control "Grab" and there are no options for screencapture system UI utility used for capture via OS shortcut
You can change the default format with TinkerTool.Is something going nuts with my system or did the 10.6.4 update changed the default screen capture format to JPG instead of PNG?