In practice, in Google's tightly controlled demo setup, it worked perfectly.
When moving the phone to scan each dot, the app is taking multiple images of the picture from different angles to effectively eliminate light glare - something Google cited as the biggest culprit in ruining digital pictures of photo prints. You'll be prompted to move your phone over each dot until it turns blue once all four dots are scanned, the app pulls together the final image. Four white circles will appear in different quadrants of the image. Once you have the picture aligned, pressing the scan button will activate your phone's flash and start the process of getting a high-quality representation of the photo. When you open up the PhotoScan app, you're prompted to line up your picture within a border. It's also a lot cheaper than sending pictures out to be scanned by a professional, not to mention faster and more convenient than using a flatbed scanner. According to engineers from Google who showed the app to the press today, PhotoScan improves on the old "photo of a photo" technique that many now use to quickly get a digital copy of old prints. PhotoScan is definitely the star of the show, though.
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