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Photoshop® CS4 Bible by Dan Moughamian, Simon Abrams, Stacy Cates

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28.3. Enhanced Measurement and Counting

Photoshop has always provided the ability to make basic width, height, and angle measurements using the Ruler tool. With the arrival of Photoshop CS3 Extended, that measuring capability was greatly enhanced with a new suite of advanced measurement tools. Photoshop now makes it possible for professionals working with technical imagery to create a custom scale for accurate measurements of features in images, such as maps, buildings, or microscopic cells.

Select portions of an image using any of Photoshop's selection methods, and calculate the height, width, area, or perimeter of your selections. Count the number of windows in a photograph of a skyscraper, or track cellular features using the Count tool. Finally, you can record measurements and counted items using the Measurement Log panel, and export that data for use with spreadsheet programs such as Microsoft Excel.

NOTE

In the spirit of sticking with a task-based workflow, you can switch to the Analysis workspace by choosing WindowWorkspace menu, or click the Workspace menu at the top right of Photoshop's Application Frame.

28.3.1. Set measurement scale

By default, Photoshop is set to use a 1:1 scale based on pixels. When you use the Ruler tool with the Default scale, it gives you its results in pixels. This isn't particularly useful when you want to measure the length of a bridge in an ...

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