Gettting Grab screen writing jpeg instead of tiff files

By default, “Grab” on MacOS saves the file as .tiff. Why? There’s no preferences to change it. Fortunately, there’s a pretty easy way by opening a terminal window and running the command line:

defaults write type png

You need to reboot for it to take affect. You can make other choices: jpg, tiff, etc.
You can also set the “location” and read the current values

defaults read

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