How Instagram straightens your photos – Instagram Engineering

How does it work?

As I mentioned, most smartphones contain sensors capable of determining the orientation and tilt of a device. When you take a picture in-app and tap on the new straighten icon, we use this sensor to straighten the photo automatically. In order to correct the angle, we rotate the photo by the opposite of the angle in which you held your device. Once the auto correction is applied, you can fine-tune the results using the feature’s UI.

via Making it simpler to take more beautiful photos – Instagram Engineering.

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