Rotating photos from mobile devices uploaded to Google App Engine | The skiing cube



I’m currently working on a Google App Engine application that allows users to upload photos from their mobile device and then view these photos in a slideshow. So far, so good, until I realized that some of the uploaded images where sometimes rotated. What the… ? This is where I learnt about the concept of EXIF metadata. Long story short: each photo on your mobile device is stored as a jpeg file which contains the photo itself, but also a bunch of extra metadata, like the photo orientation. This photo orientation depends on your mobile device orientation when the photo is taken.

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