[mrkurt]

Disclosure: I'm a happy HelloSign user.

This is what HelloSign has done since the beginning. Take a picture with your phone, send the signature in, and you can attach it to most anything. It sounds like it's not directly exposed in the Google docs addon, but you can still jump to the full app to do it.

[jfarmer]

Does it work the same as Preview? Preview actually detects my signature on the page I'm holding up and creates a vectorized version of it automatically. It's not just a photo.