

Click here to find out more information about the Ruler tool and recording measurements.

In fact, Photoshop can record measurements for several tools and can then calculate measurements such as area, perimeter and more. The Ruler tool can also be used to make measurements using custom measurement scales and record these measurements in the Measurement panel (or output to a file).The angle can be viewed in either the Options bar or the Info panel. Drag the first line and then Option -click (Mac) | Alt -click (Win) on the either endpoint and drag out the second line. The Ruler tool can be used to measure an angle like a protractor.After using the Ruler tool to take a measurement in a document, selecting Image > Image Rotation> Arbitrary will automatically enter the ruler measurement in the Rotate Canvas dialog box (and allow you to choose between rotating CW or CCW).This is an fast way to straighten a layer to a precise numeric value, without affecting the entire the document. Then, click the Straighten Layer button in the Options bar to automatically straighten the layer (based on the angle specified by dragging). If the horizon line (or anything else for that matter) is crooked in a layer, click-drag the Ruler tool along the current (angled) horizon.Here are some helpful tips for using the Ruler, Note, and Count tools – all of which are nested with the Eyedropper tool in Photoshop.
