Actually it was. As I have already posted here, I beleive the shroud to be real. There is ample evidence that it is. My point is simply on the ability of midevial mans ability to create such an image.
First you carve a relief image in wood. Then you place wet cloth over the image pressing it into the carved form. You then make a dobber out of cloth and fill it with the burial spices that were used on Jesus. Dipping the dabber into a tea, also created with these spices, you then dab the solution on the carved image. The solution lays on top of the fibers as with the shroud. When it dries it looks just like the shroud including the photographic negative effect. Simple if you have the talent.