Since I have a new laptop, I was going to measure my screen resolution. Seems I should leave the RES field blank when I make a new document but I can't figure out how to do that with PS CC2017.
It defaults to 300, so my result is 300. If I change it to 200 when I make the new document, it is 200. That's logical. Either I'm missing something here or I'm just a dimwit.