Friends, I am working with 4x5 format film and wish to make platinum prints. But I have a large inventory of photographs in digital format many of which would make great platinum, cyanotype or other process images. The trouble is, I find myself increasingly confused by the process of producing an adequate digital negative. Is it really as difficult and involved as it seems to be? There are many contradictory processes published in books and online. I'm about to give it up for lack of a well-defined process. Can anyone help point me to a simple, effective process for producing digital negs OR is there a vendor who will take a digital file and print a negative for me? Thanks so much!