If you use Gnome, Shotwell will be one of your favorite photo viewer. This simple, minimalistic application that has the ability to do all you want is soon going to get a face detection tool, thanks to a developer working on it as his Google Summer of Code Project.
The developer writes, “The next stage of this project, and probably the harder one —and I need to improve this face detection suite to actually see the results, because it would be really sad to integrate this in Shotwell and later find that it is useless.”
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Using a program called facedetect-test, users can perform face detection using multiple cascade files and multiple values and the detected faces will be marked with red rectangles.
The project is still at nascent stages and a test suite is being developed. One can expect, for the time being, Shotwell will have a face detection software in the near future.