Runco Video Xtreme VX-40d Owner's Operating Manual page 52

Section 3: Operation
COLOR — This slidebar 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 slidebar adjusts the red/green color hue for true color reproduction of
video signals connected to INPUT 3 or 4. For best results, adjust tint while displaying
an external color bars 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 2 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
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 (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 2 consecutive white pixels in the image. Without these pixels, input levels may
produce skewed colors, particularly in nonvideo images.
However, for a very unusual source exhibiting one or more overly high blacklevels (typically
caused by a noisy source causing blacklevel 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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