Christie DS+5K User Manual page 55

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 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.
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 blacklevels (black) that would cause "crushing" of light and dark colors in
the image. After entering a checkmark, wait for the six slidebar values to stabilize,
then delete the checkmark and exit. The Auto Input Level is automatically turned off
upon exit from the Input levels Menu.
BLACKLEVELS AND DRIVES -
1. Make sure overall "Contrast" and "Brightness" settings are both set to near 50.
NOTE: Not required for "Auto" adjustment.
•
Contrast
= 50 (approx.)
•
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.
3. Confirm that you are using an analog source not connected to INPUT 3 or INPUT
4, as Input Levels are not applicable for digital sources or sources going through
the decoder. A grayscale is recommended.
4. If the blacks and/or whites appear OK, input levels do not need adjustment. If
black levels are too high (and/or whites are too low, which is rare), you likely
have a noisy source that is producing skewed input levels. Continue with Step 5.
5. Temporarily enable "Auto" in the Input Levels submenu. Wait for all 6 values to
stabilize. Alternatively, do not use "Auto"—reduce blacklevels manually instead.
Judge by eye and change one or more of the six levels as necessary to obtain
proper blacks and whites. You may want to see only a certain color while
adjusting—use the "Color Enable" option (described below).
6. Delete the "Auto" checkmark and leave the Input Levels menu.
IMPORTANT: Do not use Input Levels to adjust color temperature. This will distort
Contrast and Brightness functions as well as color temperature.
To check your image levels and adjust these controls:
Section 3: Operation
User's Manual 3-29
.