November 2017
Beginner
306 pages
6h 36m
English
Content preview from Media Design and Technology for Live Entertainment
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Screen Luminance (gain)
Output (lumens) – light loss (%) / screen area (ft^2) * gain = luminance (foot-lamberts)
Image Illuminance
Foot-lamberts = (lumens / screen area) * screen gain
Desired Contrast Ratio
Light output (lumens) = [(ambient light * desired contrast) * surface area] / 0.75 for derating
Measured Contrast Ratio
[La + (p * Lamb)] / [Lb + (p * Lamb)]
La = lumen output of projector divided by the surface area of the screen multiplied by the gain
Lb = display black level
Lamb = ambient light on surface, measured in foot-candles
p = 1.0 (for front projection) or 0.2 (for rear projection)
Minimum Light Output
Lumens = (9 * image area * p * Lamb) / (screen gain – 0.2)
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