Yesterday morning I was trying a photo engrave on tile. Most of the image came out as I expected it to with the exception of the face/hat of the person on the right. I expected the underside of his hat to be dark and in shadow, like the source image. However, it looks like on that part of the image it did a negative of what was intended and made the hat shadows bright and his face dark.
I’m not sure whether the cause of this was in my source image or if something went wrong with the GF during the print. Any ideas?