Section 3: Operation
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NOTE: If the environment lighting changes, an adjustment of Gamma is
recommended (see below).
Brightness
(
SHORT CUT:
Press
Bright
an
d adjust the slide bar.)
“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
(
SHORT CUT:
Press
Gamma
and adjust the slide bar.)
“Gamma” is a global setting that determines what 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
colors. Thus, 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.
Gamma is used to fine-tune the gamma table currently in use, ranging from 1 – 3 (2.2
= default). 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. In high ambient light conditions, lower gamma may produce better results
than higher gamma. Gamma of 2.2 (default) indicates the gamma table has not been
adjusted. For more information, refer to
Advanced Image Settings
submenu,
Gamma
Table
. Again, good gamma improves contrast while maintaining good details for
blacks.
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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