If you begin work with a raw photograph or scan, chances are the image will be off-kilter – maybe just a little bit crooked, maybe a lot. Here’s an easy fix to straighten your image that does not require guesswork of how many degrees or rotation are needed.
In the sample image above, the subjects appear to be walking up a slight hill, but our objective is to have them on level ground. Beginning with CS5, the PhotoShop tools got a whole lot smarter and you can now Straighten a photo with the click of a button. The Crop tool itself will allow you to manually rotate the image, just by clicking slightly outside the crop area and pulling the image in whatever direction you desire. To have PhotoShop straighten your photo exactly, just click the “Straighten” button in the Toolbar at the top. This accesses your Ruler tool to draw a line on your image that you want to use to make your image plumb. The new tools make what use to be a more difficult task very intuitive and easy.
The “old” way of doing this was to get the Ruler tool (its hidden away on the fly-out menu of the Eyedropper tool). Find a line or edge in your image that you want to be perfectly horizontal. Click and drag out a line with the ruler tool that you want to be exactly 90° perpendicular to vertical. Choose Image – Rotate – Arbitrary. The exact amount of rotation needed (to the 100th of a degree!) will be entered into the “Arbitrary” amount box. Just hit enter and your image will rotate clockwise or counterclockwise as needed according to the line you drew.
After aligning, you will need to recrop the image to make it square again. But the girl walking her dog is now on level ground. If your image was a scan of a document or printed photograph, aligning with the edge of the original will bring the image plumb again.
Thanks to CS5 and beyond, you may never need this again!
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