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Create very unique signatures in Preview
Okay, this does work, and it's very cool--it's not just a high-contrast version of the image, it actually does some sort of edge-detection and smoothing algorithm that produces what looks impressively like a lineart drawing. I found it very difficult to get it to kick in on a face, however. At minimum, it needs a very high-contrast background--stand in front of something white. It also seems to work better if there's nothing higher-contrast to distract it in your clothing--a dark shirt, for example--so either cover up all your clothes or wear something white. And as suggested, holding something in front of you that covers your body below the blue line also seems to help it kick in. What I can't figure out is if it's actually doing a face-detection algorithm as well, in order to actively avoid a person's face--it seemed to more readily kick in with my hand than my face even though I have dark hair. People having trouble with it might if anything be because it's recognizing them as a face, and it only works when for a moment it fails to notice that there's a person in the frame. |
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