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. 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. The actual dimensions of Standard USA Brick include a width of 7.625 (194 mm), height of 2.25 (57 mm), and depth of 3.625 (92 mm). The largest ticks on a ruler represent a full inch, and the distance between each large tick is 1. Important: It gets tricky on a Retina (macOS) or HiDPI (Windows) display, which use 2x pixel density. Reading a ruler starts with understanding what all the ticks mean. If you don’t know the display resolution, you can work it out yourself using the method gener7 showed earlier in this thread. However, if you do not have a ruler or tape measure to hand. But that means the cross-sectional area is actually four times larger, which results in a massive decrease in air velocity. In this case, the 2-1/2-inch hose is exactly twice the diameter of the smaller hose. 2 inches in centimeters is around 5.08 centimeters or 50.8 milimeters. Let’s compare the difference between two of the most common sizes 1-1/4-inch and 2-1/2-inch. The only reason you might want to measure 2 inches in other terms is if you wnat to convert it to a metric measurement such as centimeters. 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. Inches are an imperial measurement, which is primarily used in America. 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. 1 centimeter (cm) 10 millimeters (mm) There are 2.54 centimeters in an inch. (It may look slightly off in the photo, but that is due to close up parallax. This is a convenient online ruler that could be calibrated to actual size, measurements in cm, mm and inch, the upper half is the millimeter ruler and centimeter ruler, the lower half is an inch ruler. 12 Inches in 30 CM ruler for more detail see our Inches to CM conversion table or you can convert any number to CM our online length convert web app. 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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