Life size 12 inch ruler3/8/2024 ![]() 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. 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. The second: Select a reference, click and hold on the ruler, move the mouse left and right to adjust the size of the actual size of the ruler. This table lists some common scale factors you may come across when dealing with different types of models.Nothing needs to be fixed. How adjusting this virtual ruler to actual size You can adjust the size in two ways: The first: To adjust the size of the ruler by select the size of your monitor. Scale factors for common engineering scales Drawing Scale For instance, a scale factor of 1/10 can be rewritten as 1:10. ![]() Step Three: Rewrite the Fraction as a Ratioįinally, rewrite the fraction as a ratio by replacing the fraction bar with a colon. Our fraction simplifier can help with this step if needed. ![]() However, yardsticks measure three feet (36 inches), and meter sticks measure one meter (100 cm). The standard length for most rulers is 12 inches (or 30 centimeters), excluding the slight margins on either end of the ruler. Again, this may not result in whole numbers, so adjust accordingly. The size of a ruler can vary depending on its intended use and the measurement system it employs. You can do this by dividing both the numerator and the denominator by the numerator. If you’re scaling down, then reduce the fraction so that the numerator is 1. If it’s not desired, then simply reduce the fraction like you would normally. This may or may not be desired, depending on your use case. Note: by doing this, the numerator may become a decimal. ![]() To do this, divide both the numerator and the denominator by the denominator. To find the final scale factor when you’re scaling up, reduce the ratio to a fraction with a denominator 1. If you’re scaling up, that is, if the scaled size is larger than the actual size, then the ratio should be shown with a denominator of 1. If you’re scaling down, that is, if the scaled size is smaller than the actual size, then the ratio should be shown with a numerator of 1. The next step is to reduce or simplify the fraction. So, the scale factor is a ratio of the scaled size to the real size. Since the scale factor is a ratio, the first step to finding it is to use the following formula: ![]()
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