Christie DS4K User Manual page 47

Contrast
Contrast
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"Contrast" increases or decreases the perceived difference between light and dark
areas of your image (0-100). For best results, keep close to 50. If contrast is set too
high, the light parts of the image lose detail and clarity. If set too low, the light areas
will not be as bright as they could be and the overall image will be dim. For best
results, start with a low value and increase so that whites remain bright but are not
distorted or tinted and that light areas do not become white (i.e., are "crushed").
NOTE: If the environment lighting changes, an adjustment of Gamma is
recommended (see below).
Brightness
Bright
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"Brightness" increases or decreases the amount of black in the image (0-100). For best
results, keep close to 50. Start with a high value and decrease so that dark areas do not
become black (i.e., are "crushed"). Conversely, high brightness changes black to dark
gray, causing washed-out images.
Gamma
Gamma
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"Gamma" is a global setting that determines how gray shades are displayed between
minimum input (black) and maximum input (white) for all signals. A good gamma
setting helps to optimize blacks and whites while ensuring smooth transitions for the
"in-between" values utilized in other grays. Unlike "Brightness" and "Contrast"
controls, the overall tone of your images can be lightened or darkened without
changing the extremes and all images will be more vibrant while still showing good
detail in dark areas when using the "Gamma" control.
The normal gamma setting of 2.2 is correct for virtually all signals and conditions. If
excess ambient light washes out the image and it becomes difficult or impossible to
see details in dark areas, lower the gamma setting to compensate. This will improve
contrast while maintaining good details for blacks. Conversely, if the image is washed
out and unnatural, with excessive detail in black areas, increase the setting. Again,
good gamma improves contrast while maintaining good details for blacks and whites.
Filter
The proper filter setting is automatically set for virtually all
signals, and rarely needs to be changed. It applies a low pass
filter for noise reduction in the incoming input signal, particularly
for HDTV or SDTV. Applied in the analog domain before
sampling, this filtering removes high frequencies and thus
reduces pixel phase noise (note this also reduces signal bandwidth). Override only if
standard pixel tracking and phase adjustments do not adequately clear up a "noisy"
video signal, or if a graphics signal appears overly "soft". Both instances indicate that
"Filter" may be set to the wrong option.
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Section 3: Operation
User's Manual 3-25
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