I have a four-color separation that appeared ok on the screen and in the proof, but a moir� appeared in the printed image. To our knowledge our screen angles and RIP settings are correct. Why is this happening?
I have seen this happen when the TVI (tonal value increase or dot gain) on the proof is low and/or very high on the litho press. In one example, the TVI was too high because the press operator had to make the magenta ink film very heavy (the magenta or yellow separations are too weak) to match the …