Quick Tip : Rotate Arbitrarily with the Ruler Tool
So you've color corrected all your files and you're ready to do some touch-ups in Photoshop when you realize the horizon line in one of your photos is not even close to straight. Sometimes, this can be done on purpose to lend an interesting perspective to a photo. But more often than not, it's just a result of us not being able to hold the camera perfectly level for every shot.We do most of our rotations when we color correct our photos in Lightroom. But every once in awhile, one sneaks through.
That being said, here's a quick way to automatically rotate your images based on the horizon line in Photoshop!
Step 1 :
Open your Image in Photoshop.
Step 2 :
Click your Eyedropper Tool and hold down until you can select your Ruler Tool.

Step 3 :
Click and drag with the Ruler Tool along a line that you want to be horizontal or vertical. I chose the wall beneath their feet.
Step 4 :
Go to Image > Rotate Canvas > Arbitrary.. Once you've clicked, you'll get a dialogue box with the exact angle and direction that your canvas needs to be rotated already inserted. All you have to do is Click OK!


Step 5 :
After your canvas is rotated, you'll see some background color on the edges from the rotation. You'll need to grab your Crop Tool, clear the width, height and resolution, and recrop your image.

You're Done!

Nifty! I use PShop all the time but I didn't know about this little trick. Thanks.