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Create very unique signatures in Preview
Authored by: Strod on Apr 10, '14 11:11:39AM

I think this may be an "accidental" feature, i.e., the developers didn't plan for it to happen.

Preview is clearly doing some rather basic image processing to enhance the signature that you are expected to present to the camera. Things like converting to B/W, enhancing the contrast, probably some border enhancement, etc. If you apply those same image processing algorithms to any photograph sometimes you end up with extremely cool and even borderline-artistic representations of the photograph. That is probably what @chaunceyjb is seeing.

But I guess the developers didn't intend that use. In fact, I believe that they first run an algorithm that tries to determine if the image the camera is seeing is likely to be a signature or simply an image of the user while he is preparing the signed sheet of paper, so as to avoid producing a potentially confusing non-signature image.

I think that is the reason why neither @robleach nor I were able to get the hint to work: it is not supposed to work, and it did for @chaunceyjb because he tried it under unusual conditions that confused the first algorithm (the one that validates the signature).

Too bad, because the hint sounded cool.



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Create very unique signatures in Preview
Authored by: crarko on Apr 10, '14 02:00:42PM

That is a bummer, because this sounded really slick.

If it turns out the hint doesn't really work, I'll remove it.

Craig A.



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