Befähigungsprüfung Drucker Und Druckformenherstellung Practice Questions - Befähigungsprüfung Drucker Und Druckformenherstellung (Austria) Exam

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In conventional Amplitude Modulated (AM / autotypisch) halftone screening for four-color offset printing, why are screen angles (Rasterwinkelung) traditionally set at 30-degree separations (e.g., Cyan 15°, Black 45°, Magenta 75°, and Yellow 0°/90°)?

To maximize UV ink drying speed under mercury lamps. To minimize visible moiré interference patterns by ensuring the three dominant visual colors are separated by 30 degrees, placing the least visible color (Yellow) at the 15-degree intermediate angle. To prevent dampening fountain solution from washing away ink dots on the plate cylinder. To align halftone dots with the paper grain direction (Laufrichtung).

Correct Answer:

To minimize visible moiré interference patterns by ensuring the three dominant visual colors are separated by 30 degrees, placing the least visible color (Yellow) at the 15-degree intermediate angle.

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