Editing Moiré pattern (section)

=== Television screens and photographs ===
{{multiple image
| total_width = 320
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| image1 = Moire on parrot feathers.jpg
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| caption1 = Strong moiré visible in this photo of a parrot's feathers (more pronounced in the full-size image)
| image2 = Moiré fringes IMG 3712.jpg
| alt2 = 
| caption2 = Moiré pattern seen over a cage in the San Francisco Zoo
| footer = 
}}
Moiré patterns are commonly seen on television screens when a person is wearing a shirt or jacket of a particular weave or pattern, such as a [[houndstooth]] jacket. This is due to interlaced scanning in televisions and non-film cameras, referred to as [[interline twitter]]. As the person moves about, the moiré pattern is quite noticeable. Because of this, newscasters and other professionals who regularly appear on TV are instructed to avoid clothing which could cause the effect.

Photographs of a [[television|TV]] screen taken with a [[digital camera]] often exhibit moiré patterns. Since both the TV screen and the digital camera use a scanning technique to produce or to capture pictures with horizontal scan lines, the conflicting sets of lines cause the moiré patterns. To avoid the effect, the digital camera can be aimed at an angle of 30 degrees to the TV screen.