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. 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. The large marks should be centered every 12. You can size these however you think looks best to fit the size board you are working with. 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. NOTE: I simply made rectangles here for these ruler marksa larger one for the foot markers, slightly smaller ones for the ¼ foot markers, and slightly smaller for the foot markers. (It may look slightly off in the photo, but that is due to close up parallax. An online ruler is a simple web tool that comes in handy when you need to quickly measure something but don’t have a tape measure at hand. And you don’t have to know what any of the numbers are, it just works. Now that you know how to print an MM ruler, you can start using it to take accurate measurements. Step 3: Print out the ruler at a 100 scale. Step 2: Open the file in your preferred program. 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. Step 1: Download the MM in a format that best suits your needs. 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. Get the plug in, or fly away.Nothing needs to be fixed. With your document open, select Print Layout on the View tab. It works for others, so obviously it's not fake. If you want a ruler that appears horizontally and vertically, first make sure youre working in the Print Layout view. If it doesn't work at all for you, there's also a reason. You don't have to add snarky comments to this page. Graduation of an inch: 1/8 1/16 1/32 ', show 1/8' markings, PPI :, Handy & Accurate Online Ruler 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. Believe it or not, there ARE uses for having an accurate online ruler, whether YOU use it or not, someone else does. Actual size ruler Your browser does not support the canvas element. If you want yours absolutely perfect, get a good ruler. I subtracted 1/10" making mine 16.9" and it was perfect (according to my possibly stretched sewing measuring tape.). It could be that the viewable screen size is the size INSIDE the browser window plus the task bar at the bottom. You have to use a wooden, metal or other type of material that won't pull.) Another thing is the VIEWABLE screen size. It was a little off with my 17" screen, but that could have been because the measuring tape was stretched slightly (for an accurate measurement, you can't use measuring tools that distort (stretch) such as sewing measuring tape.
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