How to Fix a Twisted Photo in Photoshop

We sometimes take a twisted picture unconsciously. Otherwise, when scanning a photo or document, we can often get a twisted image. I'd like to let you know how to fix it with Adobe Photoshop CS 6.

1. Open a photo you want to retouch. I used the picture of Leaning Tower of Pisa in Italy here.

2. Click right mouse on Eyedropper Tool in the toolbox, and then select Ruler Tool in the drop-down menu.  

3. Using Ruler Tool, draw a line on the photo like a image below. 

4. Go to the File drop-down menu, and then select Automate < Crop and Straighten Photos.

5. After then, you can see an modified photo below; this is an output. 

6. You can compare before and after below.