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Is it possible to add a signature e.g. from PDF files or from JPEG images instead of using a web cam? The problem is that I don't have a web cam and I would like to use this feature in spite of that.

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It appears that at present, that isn't an option. When I created a signature file using the FaceTime camera, I see that first of all, there is no unencrypted graphic file created by Preview. Preview did a new key in Keychain titled "Preview signature privacy", suggesting that the signature files go directly from Preview's camera interface to an encrypted file. There isn't a supported way to add a graphic as a signature, and the encryption makes it difficult to bypass the approved new signature process.

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That keychain entry is only a password to decrypt a file, it isn't the image file itself. So there's a file...some place on disk there's a file for the image. –  Ian C. Apr 23 '12 at 18:21
    
Good call! Where ever it's hidden, I haven't been able to find it yet, but I'll keep looking –  Daniel Lawson Apr 23 '12 at 19:31
    
I also don't have a webcam so I am unable to test it, but perhaps FSEventer would be of some use in locating that file? –  Jonathan Dumaine Jan 21 '13 at 0:41

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