Recently I was taking photos of control screens for technology in classrooms around campus. To make these screens easier to view they are often mounted at an angle. This made getting a photo at a 90-degree angle difficult.
When I cropped and added the photo to documentation, the angle of the camera was obvious.
The uneven black borders and slight skew to the buttons really bothered me. I remembered Photoshop includes tools for straightening images. I did not remember which tool allowed me to straighten the image so I just went looking at all the tools for something that looked familiar.
At that point, I noticed the Perspective Crop tool. Since the perspective in the photo caused the issue, the tool name sounded promising. I used the tool to crop the image and it did exactly what I wanted.
You can see the tool was able to make the image look as if it was taken at the 90-degree angle:
The perspective crop tool has been available since CS6. To learn how use it check out this tutorial: