Showing some plant detailing obscured under green paint

[oshfdk]

It's pareidolia, trust me. It happens a lot with this type of tool. When something is really there, it's really quite obvious. You will see such things all over the page, and its often deformations in the parchment, general unevenness, or simply a part where the contrast blurs into apparent patterns which aren't there.

This is why I only tried the contrast enhancement once and You are not allowed to view links. Register or Login to view.. There is really no way of telling if the lines under the paint that it shows is actual ink or some artificial threshold computed from paint gradients. If some ink blobs turn into a semblance of a signature, some paint irregularities can easily turn into a resemblance of deliberate ink lines. 

Uniform models that process all the pixels in the same way and do not use spacial information are much more reliable for this, but the results don't look as spectacular.