Christie DS+5K User Manual page 56

Section 3: Operation
3-30
AUTO COLOR ENABLE –
or drive to adjust will automatically enable the corresponding color in the display.
Delete the checkmark to see all colors, or to enable a different specific color through
the Color Enable Control.
This option (formerly known as sync tip
CLAMP LOCATION –
clamping) can brighten the image produced from certain high-
resolution high-frequency graphic sources. For almost all sources,
the best clamp location is automatically selected by the projector.
Use the normal Back Porch location if the image is either sufficiently bright or overly
bright. Select Sync Tip if the image appears unusually dim, if there are horizontal streaks
across the image, or if there is significant color drift. This moves the clamping pulse
from the normal backporch location (which is likely too short) to the tip of the
horizontal sync pulse. Tri Level is typically needed for an HDTV source.
Select which color or colors you want to see in the display, useful
COLOR ENABLE –
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.
The Peak Detector is a tool to assist with defining individual input
PEAK DETECTOR –
levels, enabling you to accurately set the Input Levels for any particular source with
the appropriate image. 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.
See Figure 3.15. Adjusting Input Levels Using the Peak Detector:
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 or extreme crushing.
2. Display one primary color. NOTE: Selecting Auto Color Enable ensures the
correct color is displayed for each setting.
3. For the current color, adjust its corresponding "Blacklevel" slidebar just until
a 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.
4. With the same color still active, adjust its corresponding "Input Drive"
slidebar 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.
When a checkmark is present, selecting a specific blacklevel
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