Stumbled on a link to a
very sophisticated woodcut / engraving technique.
Scroll almost to the bottom of page 1 to see the author's description of his method. He describes it in general terms, but if nothing else, the concept is facinating. (Note: The person signing his/her posts as }Raphaal{ in this thread
isn't me.
)
Though not exclusively a
Photo to Art site, this
link goes to the site the author mentions as his inspiration.
~DannyR~