Screen E-Book (.PDF) - MacDermid Autotype

2 15° moiréIt’s an unfortunate fact of life that in anyscreen set we have to have one of thecolours at 15° to the others. This is guaranteedto give a moiré as the computersimulation shows:It’s characterised by a pattern that’s at an angle of 7.5° (i.e. halfway) with a repeat every 3.8dots. You will see the 15° moiré very clearly in your film positives when you superimpose them.This is completely normal. You see the moiré because (a) in black and white the contrast is veryhigh so the eye can see the pattern very clearly and (b) you are usually looking very closely atyour positives. If you step back to a more normal viewing distance, the moiré will seem lessawful.You’ll have to read the long explanation later on to understand why you often don’t see it.But here’s the recipe for keeping it as invisible as possible.100