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58 Q-750i Series Installation/Operation Manual
PRE
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IMINAR
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ConstantContrast: Select ConstantContrast from the Advanced menu to enable (On) or
disable (Off) the ConstantContrast algorithm in the optical engine. ConstantContrast uses
a dynamic LED driver that modulates light to the DMD based on the actual content of the
video material. Runco recommends that you disable
ConstantContrast before adjusting
Brightness, Contrast or other image settings.
Adaptive Contrast: Adaptive Contrast enhancement expands the light and dark portions
of an output image according to the mean luminance of the input image.
RGB Adjust: To remove any trace of color from the white areas of the projected image,
choose
RGB Adjust from the Advanced menu and press ENTER. This displays the RGB
Adjust sub-menu, shown in Figure 4-9.
Figure 4-9. RGB Adjust Sub-Menu
•Gain: Use the Gain controls to correct color imbalances in the bright areas of the
image. A good way to do this is to use a test pattern consisting mostly of solid white
areas, such as an 80 IRE “window” pattern. If the white areas contain traces of red,
green or blue, decrease the Gain for that color.
•Offset: Use the Offset controls in the RGB Adjust sub-menu to correct color
imbalances in the dark areas of the image. A good way to do this is to use a test
pattern consisting mostly of dark gray areas, such as a 30 IRE “window” pattern. If the
gray areas contain traces of red, green or blue, decrease the Offset for that color.
The Gain controls increase or decrease the full-scale input range; the Offset controls
shift the entire range, resulting in a change in brightness.
Generally, higher Gain settings reduce the image contrast; higher
Offset settings reduce the image brightness.
Note