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One of the other tools buried underneath the Eyedropper tool slot is the Ruler tool and you can use that to measure things, things like distances, or segments, and angles as well. I am going to go and drag a line on this horizon because you can see that the image is rotated here. It's a little bit crooked relative to the horizon line. So I'm just going to drag with the Ruler tool across this horizon line to kind of figure out what that angle is. Then if I go to the Image menu under Image Rotation and choose Arbitrary, Photoshop automatically passes that rotation angle that the Ruler tool figured out to the Rotate Canvas dialog, and when I click OK, it does the rotate for me automatically.
So a pretty cool trick. Just draw a line across the thing that you know is supposed to be straight, go to Image > Rotate Canvas > Arbitrary and it will figure out the math for you.
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