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Glossary
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Active Line TimeThe time, inside one horizontal scan line, during which video is generated.
Alternative ContentNon-cinema program material such as concerts, plays, sporting events, and potentially corporate training or conferencing, presented in theatres in addition to motion picture exhibition.
Ambient Light RejectionThe ability of a screen to reflect ambient light in a direction away from the “line of best viewing”. Curved screens usually have good ambient light rejection. Flat screens usually have less ambient light rejection.
Analog VideoThe video output of most computers and videotape machines. Analog video can generate a large number of colors.
AnamorphicHaving or requiring a linear distortion, generally in the horizontal direction. Anamorphic lenses can restore a ‘scope’ (CinemaScope) or ‘flat’ format film frame to the correct wide-screen appearance by increasing its horizontal proportion.
ANSIThe American National Standards Institute is the organization that denotes the measurement standard for lamp brightness.
Aspect RatioThe ratio of the width of an image to its height, such as the 4:3 aspect ratio common in video output. Can also be expressed as a decimal number, such as 1.77, 1.85 or 2.39. The larger the ratio or decimal, the wider and “less square” the image.
Auto SourceThe ability of the projector to automatically recognize and synchronize to the horizontal and vertical scan frequencies of an input signal for proper display.
Automation

A system used in a theatre projection booth that responds to cues, commands or relay switches and then controls various elements of presentation, such as:

  • picture format and corresponding lens (flat or scope)
  • sound format and corresponding cinema processor settings
  • curtain movement and position
  • lighting level in the auditorium
  • non-sync play and fade in/out
  • digital cinema projector
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Technology Explained

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