There are many tricks in the forger's handbook, and a traced over signature is one of them.
Here is how it works.
- The forger gets a high resolution digital image of an authentically signed photo.
- Make a photo print of the authentically signed photo.
- Then, trace over the printed signature on the photo with a marker to give it the appearance of real ink of the photo.
This practice can be deceptive, but often you can see signs of hesitation or slowness as the forger is careful to cover the printed signature. In some cases, you can still see traces of the printed signature peeking out where the forger failed to completely cover the printed signature.
Here is an example of a print of an authentically signed photo that appears to have been traced over with Sharpie. The arrows point to areas where the forger did not completely cover the printed signature.