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OSX's Preview allows you to import your signature by writing in on a white notecard or similar and holding it up the webcam. It then stores a vectorized version which can be added to PDFs.

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Caution that a vector graphic could look too clean in some situations. Clearly an issue per the OP.

See my note above re blurring the lines a little in Photoshop.

Thanks for this tip! Preview has evolved so many little features the name is borderline misleading at this point.

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