Christie DLV1280 DX User Manual page 68

PEAK DETECTOR –
The Peak Detector is fast method of defining individual input
levels, and may improve the accuracy of input levels set by the Auto Input level
function. Enabling the Peak Detector activates a special operating mode that detects
only pixels that are considered black or white—all other levels are displayed as a
mid-level gray. When used with a 16-step grayscale pattern, where the black and
white bands are known to be at the edges of the image, you can watch these isolated
areas while adjusting individual blacklevels and input drives as necessary. Images
from this source will then display correct blacks and whites without crushing.
See Figure 3.19.
1) Display a 16 level grayscale test pattern from the desired external source, and
enter a checkmark in the Peak Detector checkbox. NOTE: The "Peak Detector"
will initially render the grayscale as a uniform gray field before adjustment.
2) Display one primary color (use Color Enable to select).
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 white appears at the opposite edge of the screen. This
band represents the last band of the grayscale pattern, which should be 100%
white. 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 band, the input levels
for this source are correctly set. Upon exiting the Input Levels menu, the Peak
Detector checkbox will clear.
Figure 3.19. Adjusting Input Levels Using the Peak Detector
(RED EXAMPLE SHOWN)
DLV1280 DX User's Manual
OPERATION
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