I use ⌃⇧⌘4 first, then I paste it into Mail, when I double click the image that I pasted, it is TIFF format.
I try to change the screenshot format to png, it works. But when I change back to jpg or bmp, both of them will be saved as TIFF format.
defaults write com.apple.screencapture type jpg
How can I save it as jpg format?