![]() ![]() If you wish to make a durable ruler, I suggest printing on cardstock paper and laminating it. When printing, don’t select the option, Scale to Fit. Save it to your computer or send it to your printer. 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. To download, click one of the millimeter ruler images below. 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. Miss Accurate (22' monitor) I entered my correct monitor size, and when I put an actual metric ruler up to the metric ruler image on your site, yours was 2 mm short. There are also some engineering rulers, business card rulers, and measuring tape. Important: It gets tricky on a Retina (macOS) or HiDPI (Windows) display, which use 2x pixel density. So, when you select your monitor size the site calculates and sets the pixel size of a ruler image and the result is accurate ruler in its actual size. Some of these printable rules include a meterstick, 15-cm mm ruler, yardstick, square, and a 12-inch by 1/10 inch ruler. 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 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. ![]() ![]() (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. 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. 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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