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Straightening a Crooked Image in Adobe Photoshop CS5

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In this excerpt from Photoshop CS5 for Windows and Macintosh: Visual QuickStart Guide, Elaine Weinmann and Peter Lourekas show you how to straighten a crooked image using the Ruler tool.
From the book

When used with its Straighten option, the Ruler tool squares off a crooked image based on a line you drag and also crops the image to remove any blank canvas areas that result around its borders.

To straighten a crooked image: star.jpg

  1. Choose the Ruler tool ruler-tool.jpg (I or Shift-I).
  2. Drag along a feature in the image that you want to orient horizontally or vertically.A If you need to adjust the line, move either endpoint. The current angle is listed as the A value on the Options bar.
  3. On the Options bar, click Straighten.B Easy!
    • To straighten an image without cropping it, hold down Alt/Option as you click Straighten and until the command is done processing.
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