For my Mac’s settings, (1800 pixels / 11.875 inches) * 2 = 303 ppi, and entering that in Screen Resolution lets Print Size show the Photoshop ruler at an on-screen size that matches a real ruler.Īlso important: For both Actual Size and Print Size to work properly, the document physical dimensions in inches/cm and the PPI resolution (you set both in Image > Image Size) must match the final reproduction dimensions and resolution. You can make the necessary measurements on any device that allows you to browse the web. For a Retina/HiDPI display, take the pixel width from the UI scaling selected in Displays, as gener7 showed, and then after doing the calculation, double the result to compensate for 2x pixel density so that you get the correct number for Screen Resolution. Calibrate If you want to measure the actual size of a small object in inches or centimeters and you don’t have a real ruler at hand, this virtual on-screen online ruler will help you. Important: It gets tricky on a Retina (macOS) or HiDPI (Windows) display, which use 2x pixel density. If you don’t know the display resolution, you can work it out yourself using the method gener7 showed earlier in this thread. If Actual Size is not accurate, use View > Print Size after manually calibrating it by entering your screen resolution in Preferences / Units and Rulers / Screen Resolution. It is believed that between a brilliant person who strives for glory and a brilliant person who shuns it, the latter is least likely to abuse the power they are given, automatically making them a passable, if not. It does match up perfectly when your eye is directly above each marker.)Īctual Size might not be accurate with some computer and graphics hardware combinations. A Reluctant Ruler is someone who is entrusted with permanent power over others despite desperately trying to avoid it at all costs. (It may look slightly off in the photo, but that is due to close up parallax. And you don’t have to know what any of the numbers are, it just works. i measured the 10 inches of the ruler shown. in case youre european: 1 inch is 254mm or 2.54cm. i measured the diagonal of my notebook display with a ruler and its 14.95 inches, so i set exactly that. When Actual Size is used, Photoshop gets the display pixel density from the Mac hardware, and uses that to correct the display magnification, so the Photoshop ruler matches the real ruler that is against the screen. time>rest (15' monitor) to the people who say the size is wrong: set the ACTUAL size of the monitor (diagonal in inches), even decimals matter. The screen shot posted earlier by gener7 is from a Mac.īelow is the ruler in Photoshop on my MacBook Pro after choosing View > Actual Size in Photoshop. The Actual Size command works automatically on a Mac.Īll of the replies I posted are from my Mac.
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