So I just discovered tonight that the patterns I made for my Daz Studio 4 Manga shader can also be used in Photoshop to dynamically generate screentone patterns.
Image 1 is a random Hatsune Miku image I found, enlarged.
Image 2 is that same image with the screentone effect applied.
Image 3 is a Jason promo image enlarged, screentoned, and then shrunk again.
Image 4 is the below Visual Novel image screentoned. As you can see, instead of looking like it came from a Visual Novel, it now looks like it came from a manga.