First: I totally forgot to add a link to Holopainen's web page.. here it is:
Secondly: This process seems to be easy, but it is actually really difficult to master!
It doesn't take a lot of time to make the plate, but then....
It is a process, that requires a good photographer to make the optimal inter positive (which isn't as easy as it seems), and then it requires a really good graphic printer, in order to make a really good print...
Photographers tend to think that the printing isn't going to be that hard.. - the graphic printers think the same about the photographic part of the process..
Both will be wrong!!
(but it is still fun!)