- This might help: If you believed that the image was not painted, wouldn't you suspect that it was an imprint of an actual dead body?
Let's say I do (I don't, but let's play Make Believe for a bit). The Middle Ages were a time when dead bodies were on public display. It would have been trivial to find one--the local gallows would have been a good source. Or the local morgue. Or grave yard. The early natural philosophers utilized all three sources. Put something on the dead body, put the body on the shroud face-down and whack it (transferring hte stuff in a straight line to the cloth). Then put the body on the shroud face-up and whack it (again, transferring the stuff in a straight line). Nothing that folks in the Middle Ages couldn't have done. And remember, the Crucifixion was the most popular story in that time period--one that literally EVERYONE knew. Some folks even took to temporarily crucifying themselves as a form of pennance. So matching the wounds with the story was trivial. Even finding someone with the wounds already wouldn't have been terribly hard; just go to the nearest monastery, and if they didn't have someone on-hand they'd point you in the right direction.
