The two Terminal commands that can change the image format and save location for OSX’s default screen capture are:
defaults write com.apple.screencapture type image_format defaults write com.apple.screencapture location /Full/Path/To/Folder
image_format can be the following as of of my knowledge
- bmp (Windows Bitmap)
- gif (Graphic Interchange Format)
- jp2 (JPEG-2000)
- jpg (Joint Photographic Experts Group)
- pdf (Portable Document Format)
- pict (PICT)
- png (Portable Network Graphic)
- psd (Photoshop)
- sgi (Silicon Graphics Image file format)
- tga (Targa image file format)
- tiff (Taggged Image File Format)
To avoid logging out for the changes to take effect, you can enter the command.
killall SystemUIServer
There’s also a preference pane that can do this automatically, but it’s shareware.