Christie 1920-DX, User Manual

Page: 57 / 172

Section 3: Operation
013-100199-04 3-29 .
COLOR:
This slide bar adjusts the color saturation level, i.e., the
amount
of color in a
video image. Lower settings produce less saturated colors — for example a setting of
“0” produces a black and white image. If the color level is too high, colors will be
overpowering and unrealistic.
TINT:
This slide bar adjusts the red/green color hue for true color reproduction of
video and HDTV signals connected to Input 3 or 4. For best results, adjust tint while
displaying an external test pattern—otherwise, it is recommended that tint remain at
its default setting.
DECODER LUMA DELAY:
This control affects any incoming composite or S-video
signal, delaying the luma signal (intensity) in relation to the chroma (color). In the
image, increasing the luma delay will move luma (seen as a shadow where colors
overlap) to the right slightly, with colors remaining in place. Decreasing this delay
will move the shadow slightly to the left. If necessary for your current source, adjust
so that no shadows occur with adjacent colors.
Input Levels
— SUBMENU
NOTES: 1) Because the projector automatically optimizes input levels for all but the
most unusual of sources, it is recommended that only experienced users use the Input
Levels submenu. 2) Before beginning, check that overall contrast and brightness
settings are near 50 and that color temperature is properly set up on an internal
grayscale test pattern. 3) There must be at least two consecutive white pixels present
in the image for proper “Auto Input Level” function. Leave this control off after use.
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.
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