Photoshop is starting to bum me out (but it could be my intelligence too).
I need to paint something on a 120mmx121mm 72ppi canvas, and when I create two canvases with the same specs, they're different sizes. (No I did not accidentally zoom in on the one).
Why are they different sizes? Why do the pixel dimensions differ on both images, even though when creating the documents, I made them both exactly the same?