Scannable is a well-regarded document scanning app we built at Evernote. I owned the capture experience—and pushed heavily for removing the capture button. This made for a simpler, and better capture experience, allowing the app to capture at the right moment and avoiding the user needing to contort their hand to hold, and tap the capture button while holding the device parallel to a desk.
I defined the capture animation and worked intimately with our remote R&D team as well as in-house developers to achieve a seamless capture experience. Not immediately obvious is the attention required to timing, both from a user perspective (capture too fast and the user is surprised, for example) and the speed at which the hardware could capture and move image data around the system (see diagram).
One of the most visible parts of the capture experience was the 'ready to capture' indicator. We wanted to impart a 'hi tech' feel to encourage a hands-off attitude to the user.
Next up: Experimentation