Straightening a Crooked Photo
Open the photo that needs to be straightened. The photo I will use is shown below:

First select the ruler tool
from the tools panel. Next you need to let Photoshop know where the straight edge should be. Draw a line in the image to represent the new straight horizontal edges shown below:

Click the Straighten button at the top of the document window.
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Your frame should now appear straight as shown below:

How easy was that?