Prime-time for Contone Proofing

"The problem is human-oriented, really," he concedes. "By utilizing color-managed proofing, in addition to dot gain simulation, we introduce artifacts, distinct from the original color separation. Those artifacts come from certain printing imperfections such as ink contamination, ink density, substrate, and other factors. Halftone screening on those proofs will show some artificial dots, possibly causing confusion for even very experienced printers."