The reason no one talks about the digial negative much is because it is a great conspiracy to make you buy Dan's book 8)(posted 8076 days ago)With flagrant disregard for the vow of secrecy taken by digital negative makers, here's the process. Get image into computer. Manipulate in photoshop. Output photoshop file either by printing on film base with photo printer, or sending to an image setter to let them create a litho film negative.
It works well. For details, by the book.