Glossary A–ZLetter M
Moiré effect
The moiré effect is a visible interference pattern of waves or stripes that appears when two fine, regular grids overlap.
Neither grid contains the pattern itself. It only arises from the way they interact.
With screens, the effect occurs mainly when a camera films an LED wall or a display: the grid of the pixels meets the grid of the camera sensor. This affects television broadcasts from stadiums, stage recordings and photos of trade fair stands. Moiré can also arise in the content itself when fine lines, checked patterns or fabric textures are displayed or scaled down on a screen with too low a resolution.
To counter moiré in camera recordings, a different distance, a different angle or slightly changed focus helps; LED walls with a fine pixel pitch are less susceptible. In content, fine regular patterns should be avoided, especially in clothing and pictures of buildings. Operators whose surfaces are filmed should hold a test with the camera crew in advance.