Acer U5220 Series User Manual page 33

If turned on, the projector dynamically adjusts the power
consumption of the lamp according to the brightness of
Dynamic Black the image being projected. When projecting darker images
the power consumption will be reduced and the contrast of
the image will also be enhanced.
Effects the representation of dark scenery. With greater
Gamma
gamma value, dark scenery will look brighter.
Note: "Saturation" and "Tint" functions are not supported under computer
mode.
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