Input Levels - Christie DLV1280 DX User Manual

OPERATION
VIDEO TERMINATION —
Enter a checkmark
to terminate the video inputs 3 and 4 (75
S
).
The input should be terminated unless
the signal loops through (continues) to
another projector or display device, in
which case only the last projector in the
chain should be terminated.
ENABLE DECODER AGC –
The "automatic gain control" affects decoded video images
only. Enter a checkmark (default) for most decoded video sources—this activates the
AGC circuit to ensure properly bright images. Delete the checkmark if a decoded
video image exhibits strange color artifacts such as stripes in highly saturated colors,
indicating an incompatibility between this source and the AGC.
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

NOTES: 1) It is recommended that only experienced users use the Input Levels
submenu—the projector automatically optimizes input levels for all but the most
unusual of sources. 2) Before attempting an input level adjustment, 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 one white pixel
present in the image for proper "Auto Input Level" function. Leave this control off.
Good RGB or input
levels—that is, the
drives and blacklevels
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
Figure 3.18. Input Levels Submenu
(and in an "Auto Setup"
from the Main menu), 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 1 white pixel in the image. Without a white
pixel, input levels may produce skewed colors, particularly in non-video images.
However, for a very unusual source exhibiting overly high blacklevels (most often
caused by a noisy source that causes blacklevel spikes), an experienced user may
prefer to use the Input Levels menu (see Figure 3.18). These adjustments, which are
actually a calibration process to compensate for differences in sources and cabling,
enables an experienced user to perfect the source image input levels. Note that Input
3-33
DLV1280 DX User's Manual