If you don’t like to have screen shots in default PNG format, this HowTo will help you changed it. You can change the default file type for screen captures by using a terminal command.
Most major image formats are supported including PNG, PDF, GIF, TIFF, and JPG.
- Launch Terminal and insert this command
defaults write com.apple.screencapture type tiff
This command will change file type from PNG to TIFF, for desired file type replace “tiff” to another supported file type
- For immediately effect of changes use this command: