EXIF thumbnail generation is done by Android. There is a set of API to
get/set the desired size of the thumbnail and also to retrieve the list
of possible thumbnail sizes:

http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupportedJpegThumbnailSizes()

However there is no guarantee that a thumbnail size with the same aspect
ratio as the pictures is going to always be available. That said, the
solution would be to add logic in qtubuntu-camera to use the APIs above
to select the appropriate thumbnail size. For that to happen these APIs
need to be exposed in libhybris first.

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https://bugs.launchpad.net/bugs/1376500

Title:
  thumbnails in metadata generated incorrectly

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