Christie roadie 25k User Manual page 86

OPERATION
Gamma
Press an
( d adjust the slidebar.)
Gamma
SHORT CUT:
"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 settings
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 fine-tunes the gamma table currently in use, ranging from 1– 3 (default =
2.5, indicating that the chosen gamma table has not been adjusted). 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 unnatural with
excessive detail in black areas, increase the setting. For more information, see
Gamma Table. Again, look for good contrast and good details in very dark areas.
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.
Detail
"Detail" adjusts the sharpness of a video image so that edges remain clearly defined.
It can be particularly useful if a significant "Noise Reduction" adjustment has caused
the image to appear too soft. Adjust until the display is as sharp as desired, keeping in
mind that because "Detail" adds some high frequencies back into the image, it can
also re-introduce a certain degree of noise.
Noise Reduction
Noise reduction is similar to the "Filter" control, but operates in the post-sampling
digital domain with a more subtle effect. Higher settings are most useful for clearing
up noisy RGB images such as those from a PC. Adjust as desired, keeping in mind
that reducing noise (which reduces high frequencies) may also soften the image.
Color Space
"Color Space" determines how the color components of an
analog input signal or certain digital signals connected to
INPUT
or are decoded for accurate color in
1, INPUT 2, INPUT 5 INPUT 6
the display. Although color space for these analog signals is
3-30
Roadie 25K User's Manual