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62 Runco SC-1 Owner’s Operating Manual
PRE
L
IMINAR
Y
Video Options: This sub-menu is not applicable to the SC-1.
Input Levels (Input 1 only): Good RGB or input levels — that is, the drives and black
levels for each of the three primary 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.
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 technician
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 technician 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.
• Auto Input Level: Keep off for virtually all sources (default). Temporarily enter a check
mark only if you are an experienced technician and you have an unusual source that
you feel needs further color temperature and/or input level adjustment. After entering a
check mark, wait for the six slidebar values to stabilize, then clear the check mark and
exit. 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.
1. Input Levels are not applicable to (DVI) Input 2.
2. Because the projector automatically optimizes input levels for all
but the most unusual of sources, it is recommended that only
experienced technicians use the Input Levels submenu.
3. 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.
1. There must be at least two consecutive white pixels present in
the image for the “Auto Input Level” function to work properly.
Otherwise, input levels may produce skewed colors, particularly
in non-video images.
2. Uncheck this item before exiting this menu.
Note
Note