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
From the book
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: 
- Choose the Ruler tool
(I or Shift-I).
- 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.
- 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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