[riffraff]

I wonder, on my macbook I always did cmd+shift+3 or cmd+shift+4 without hitting ctrl.

I am not sure if there is a difference, if not maybe you can simplify the message :)

[slig]

Without ctrl, the print screen is saved on your Desktop as a PNG. With ctrl, the screenshot is copied to the clipboard.

[riffraff]

ah awesome thanks :)