Make the Rulers Visible?
Just press Command-R (PC: Ctrl-R) and rulers appear across the top and left side of your image window. That’s it.
ADVANCED TIP: CHANGE STARTING MEASUREMENT
If, for some reason, you don’t want the top-left corner of the image to be measured starting at the 0x0" point, you can click-and-hold directly in the top-left corner of the image window (not in the image, in the window—right where the vertical and horizontal rulers meet), and drag the starting point to a new location (for example, if you want to start measuring 2" into ...
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