For basic document scanning, I'm not seeing much of a difference in capabilities and scanning experience between using the Scan app and the main Dropbox app. The Scan app does avoid an extra click or two by providing a default location and quality setting.
I see a difference in scan quality and file size. Scan app files are more than twice as big (1.5MB vs. 525KB) at highest quality. Reducing quality on either platform to balanced/medium reduces file size by about a third (1MB or 424K, respectively). I don't understand why the files are so huge - I produce a file a tenth of the size (116K for the same doc) from my Epson desktop scanner. The Scan app did a better job ignoring highligher marks on the page - unless you wanted to see these on the PDFs as well - the highlights are completely gone on the scan. But it also did a worse job preserving lighter color text on the page - these indicate to me that it is using a lower threshold for discerning white vs. black.
Good to have options, I suppose. But based on my quick and dirty comparison here, I might just stick with the main Dropbox app for now. It avoids the need for yet another app, produces smaller files, and offers some additional control (e.g., manually selecting document corners); it's even already there for Android.
It might make sense for Dropbox to instead provide a widget to provide a direct path to the main app's scanning function, that provides a more streamlined capture experience. Smaller (much smaller) file sizes and a darkness/threshold control wouldn't hurt either. Oh, and OCR to embed searchable text.
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