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Are there any tools out there to automatically level an image?

Are there some apps that will automatically guess at how to straighten thousands of photos?

In other words, if I have a lot of photos with non-horizontal horizons, is there an app or plug-in that will go through them all and make an educated guess and straighten them automatically? Alternatively, an app that is semi-automated, i.e. asks me for help when it has a low degree of confidence.

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