- In Photoshop, you can use the measure tool to drag a line across the horizon. Photoshop will remember the angle, and when you go to rotate the image, it will automatically fill in the correct angle of rotation. However, when you use this method on a photo that only has a background layer, you'll still need to crop the image as second step. You might as well do it all in one step with the crop tool.
- Photoshop Elements has two commands for automatically straightening an image. Image > Rotate > Straighten Image, or Image > Rotate > Straighten and Crop Image. However, these commands were designed for scanned images that weren't placed on the scanner glass straight. It usually doesn't work for digital photos with a skewed horizon, because there's no way to indicate to Elements what should be horizontal.
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