To learn more about how to use this helpful tool, see our tutorial video and other Photoshop resources. This will let you enter your desired numbers, which will then give you the actual distance between two points. In this case, you will need to create a custom measurement scale. ![]() Sometimes, the two lengths you’re provided may not be the exact distance from the two points. For example, let’s say you’re measuring two lengths in protractor mode, indicated by D1 and D2. However, sometimes the tool isn’t as accurate as it could be, and it may need a few more tweaks for you to get a proper readout. So, instead of simply guessing, you can use the tool to make a straight cut that will crop your image, or you can use it to quickly find an angle that will let you turn your image however you see fit. As mentioned earlier, this is especially true when you are trying to crop an image or rotate it a specific number of degrees. The Ruler tool is especially helpful when it comes to trying to find exact distances between two points in order to fix images. The tool can also be used to straighten images that may need to be cropped or to get a more concrete measurement to rotate your image. Protractor mode lets you take the angle measurements of your image by adding a second distance line after you have drawn your first. For example, one feature of the Ruler tool is protractor mode. The tool can be used for different types of actions. There are even vertical and horizontal cursors that follow your movements along the screen so that you always know your mouse’s exact location along the X and Y axes. You can adjust their sizes, create multiple start and end points, and lock them so that all new points must be placed along the measurement markings for precise accuracy. The rulers themselves are remarkably flexible. Hold down the Shift key to constrain the tool to multiples of 45. To create a protractor from an existing measuring line, Alt-drag (Windows) or Option-drag (Mac OS) at an angle from one end of the measuring line, or double-click the line and drag. If you want to change the unit of measurement of your ruler, right-click. To turn the rulers off again just hit the same keyboard shortcut. ![]() A ruler will appear along the top and along the left-hand side of the interface. Setting the scale allows you to measure specific. To show or hide rulers in Photoshop, choose View > Rulers or press Cmd + R (Mac) or Ctrl + R (Windows). You don’t have to be a geometry expert to get the hang of it, though, as Photoshop does most of the heavy lifting for you. Hold down the Shift key to constrain the tool to 45 increments. Photoshops measurement scale equates the pixels in your image to scale units like inches or millimeters. There are unique measurements for your start and end points, your width and height, your angle, and even your total distance. When selected, the tool appears as two rulers that span vertically and horizontally along the left side and top of your document window respectively. Certain tools in Photoshop help get you the most accurate measurement, and the easiest one to use is the Ruler tool. You could simply try to eyeball it, but that doesn’t always have the best outcome. When using Photoshop, sometimes you need to measure the distances to crop your image to a specific size, or you might need to measure the angles in your image to rotate it a precise number of degrees.
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