Sounds awful. I have only used Pictorico Ultra Premium OHP Transparency Film with silver printing. I have used the PDN color ink process and more recently the Ware process using black inks to make my diginegs, and I see no dither in highlights even at "several inches". Only with a loupe. The Ultra OHP may prevent ink dot spreading better than your substrate, and so give a less noticeable dither. Or, maybe your adjustment curve needs a tweak in the highlight area?
Don't give up on diginegs for silver, it is possible. I'd hate to be without the benefits of diginegs, only have to burn/dodge once ... best wishes ... J
Bookmarks