Christie Mirage HD User Manual page 56

Section 3: Operation
3-28
Good RGB or input levels—
that is, the drives and black
levels for each of the three
colors, red, green and blue—
ensure that images from
analog sources other than
decoded video have
maximum contrast without
crushing black or white. By
default (and in an "Auto
Setup"), the projector
automatically determines the
best input levels by
monitoring image content and adjusting the controls appropriately—further
adjustment is typically not required to obtain proper blacks or whites.
NOTE: This automatic adjustment requires at least 6-12 consecutive white pixels in
the image. Without these pixels, input levels may produce skewed colors, particularly
in non-video images.
However, for a very unusual source exhibiting one or more overly high black levels
(typically caused by a noisy source causing black level spikes), an experienced user
may prefer to use the Input Levels menu (shown above). These adjustments, which
together serve as a calibration process compensating for differences in sources and
cabling, enable an experienced user to perfect the source image input levels and
eliminate the "overshoot" and "undershoot". Note that Input Levels are of limited use
with digital signals, but do offer some ability to tweak poorly mastered source
materials.
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.
Temporarily enter a checkmark only if you are an experienced
AUTO INPUT LEVEL –
user and you have an unusual source that you feel needs further color temperature
and/or input level adjustment. This compensates for incoming out-of-range drives
(white) and black levels (black) that would cause "crushing" of light and dark colors
in the image. After entering a checkmark, wait for the six slide bar values to stabilize,
then delete the checkmark and exit. The Auto Input Level is automatically turned off
upon exit from the Input levels Menu.
BLACK LEVELS AND DRIVES -
1. Ensure overall "Contrast" and "Brightness" settings are both set to near 50.
NOTE: Not required for "Auto" adjustment.
•
= 50 (approx.)
Contrast
•
Bright = 50 (approx.)
2. Check the color temperature setup using an internal grayscale test pattern, making
sure to obtain a neutral grayscale.
NOTE: Not required for "Auto" adjustment.
To check your image levels and adjust these controls:
Mirage S+/HD, Matrix S+/HD, Christie HD/DS/DW, DLV User's Manual
020-100001-04 Rev. 1 (12/07) - Software v1.6g or higher