I recently bought a MacBook Air and I am not being able to capture a signature in a white sheet of paper with camera, as it was possible in previous machines and mac OS versions.
Does someone have a hint on how to solve this?
When you select the camera on the Preview.app, It should open the camera up. You need keep some distance between the FaceTime camera and the white paper only then Preview.app will pick it up. If it's kept too close, the signature will not be picked up.