8. Set up the picture
8.6 Use g amma curves
About
Main m enu — Picture — Gam ma
Gamma compensation, or gam m a correction, is a way of adjusting the signal input to light output characteristics of a display or
projector in order to su it the eye’s sensitivity to different light levels and to com pensate for non-linearities in displays. Without gamm a
compensation, images m ay look too dark or too bright, lack detail or depth. By adjus ting the amount of gamma com pensation
changes, you c an change not only the perceived brightness levels, but also the ratios of red to green to blue.
Different types of displays have different gamma factors that need to be corrected in order to look and be perceived the same. For
example, an MS Windows generated image displayed on a CRT monitor will re quire a gamma correction value of about 2.5 to avoid
color bleaching and burning.
The gamma curve correction formula is based on output level = input level ^ gamma.
Gamma curves
The pro jector has a range of built-in gamm a curves, available at M ain menu — Picture — Gam ma.
The name of the curve, for example, Co mputer 1, describes the recommen ded use.
Some curves are reserved f or A dvanced or Service us ers, and will only be viewable after the access code is input.
Using any o f the computer cu rves for video applications will resu lts in significant image noise.
Output
Input
Computer 1
Output
Input
Computer 2
Output
Input
Film 2.2
Output
Input
Film 2.4
Output
Input
Film 2.6
Output
Input
Film 2.8
Image 8-1
601–0307–00 F50 25/02/2016 77
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