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.
Read full article from Rotating photos from mobile devices uploaded to Google App Engine | The skiing cube
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