Christie roadie 25k User Manual page 88

OPERATION
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Roadie 25K User's Manual
NOTE: Clamp Location is not used for video sources or any RGB source with sync
information included on the video (e.g., sync-on-green). Use Tri Level instead.
COLOR ENABLE –
Select which color or colors you want to see in the display, useful
while working with color temperature white levels or input levels.
NOTES: 1) Input levels apply for the current source only, but for any color
temperature used. 2) Assuming that color temperature has been set up based on the
internal test patterns, you can then set up input levels for a given source so that it
matches the color temperature of the internal test patterns.
PEAK DETECTOR –
The Peak Detector is a fast method for defining individual input
levels, and can improve the accuracy of input levels set by the Auto Input level
function. Enabling the Peak Detector activates a special operating mode for detecting
only pixels that are considered black or white—all other levels are displayed as a
mid-level gray. When used with a smooth grayscale pattern in which black and white
are known to be at opposite edges of the image, you can watch these isolated areas
while adjusting individual blacklevels and input drives until both black and white
edges are just visible and distinguished from neighboring pixels. Images from this
source will then display correct blacks and whites without crushing or washing out.
See Figure 3.15. Adjusting Input Levels Using the Peak Detector:
Display a 16 level grayscale test pattern from the desired external source, and
1)
enter a checkmark in the Peak Detector checkbox. NOTE: The "Peak Detector"
will initially render the grayscale as a uniform gray field before adjustment.
Display one primary color (use Color Enable to select).
2)
For the current color, adjust its corresponding "Blacklevel" slidebar just until a
3)
single band of black appears at one edge of the screen. This band represents the
first band of the grayscale pattern, which should be 100% black. Do not adjust
too far.
With the same color still active, adjust its corresponding "Input Drive" slidebar
4)
just until a single band of color appears at the opposite edge of the screen. This
band represents the last band of the grayscale pattern, which should be 100%
white (or the current color, if a certain color is enabled). Do not adjust too far.
Go back and check the black band—adjust the blacklevel slidebar if necessary.
5)
Adjustments are related, so you may have to go back and forth until both bands
are just optimized.
Repeat Steps 2-5 with the other two remaining primary colors. When each
6)
primary color shows one optimized black band and white (or colored) band, the
input levels for this source are correctly set. Upon exiting the Input Levels menu,
the Peak Detector checkbox will clear.