Christie J Series User Manual page 76

Section 3: Operation
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.
beginning, check that overall contrast and
brightness settings are near 50 and that color
temperature is properly set up on an internal
greyscale test pattern.
Remote Keypad
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.
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.
For a source exhibiting overly high black levels (typically caused by a noisy source causing black level spikes)
use the Input Levels menu (shown above). These adjustments, serve as a calibration process compensating for
differences in sources and cabling, to perfect the source image input levels and eliminate the "overshoot" and
"undershoot". NOTES: 1)
poorly mastered source materials.
temperature used.
can then set up input levels for a given source so that it matches the color temperature of the internal test
patterns.
• AUTO INPUT LEVEL
Use only if you are an experienced 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
black levels (black) that would cause "crushing" of light and dark colors in the image. After entering a
checkmark, wait for the six slide bar values to stabilize, then delete the checkmark and exit. The Auto Input
Level is automatically turned off upon exit from the Input Levels Menu.
• BLACK LEVELS AND DRIVES
To check your image levels and adjust these controls:
1. Ensure overall "Contrast" and "Brightness" settings are both set to near 50.
"Auto" adjustment.
C
ONTRAST
B
RIGHT
= 50 (approx.)
2. Check the color temperature setup using an internal greyscale test pattern, making sure to obtain a neutral
greyscale. NOTE:
3. Confirm that you are using input on an Analog BNC card or a Dual Link DVI card. Input Levels are not
applicable for sources going through the decoder. A greyscale is recommended.
3-26
2) Before
3) Refer to 3.1.1
Commands, "AUTO".
Input Levels are of limited use with digital signals, but do offer some ability to tweak
2) Input levels apply for the current source only, but for any color
3) Assuming that color temperature has been set up based on the internal test patterns, you
= 50 (approx.)
Not required for "Auto" adjustment.
Input Levels
1. Auto Input Level
2. Red (Pr) Blacklevel
3. Red (Pr) Input Drive
4. Green (Y) Blacklevel
5. Green (Y) Input Drive
6. Blue (Pb) Blacklevel
7. Blue (Pb) Input Drive
8. Auto Color Enable
9. Clamp Location
10. Input Peak Detector
11. Color Enable
F 3-27 I
IGURE NPUT
J Series 1000W and 1200W User Manual
Turn OFF before
leaving menu.
256
256
Levels adjust
256
automatically
256
and correctly.
256
256
Back Porch
White
L
EVELS
NOTE:
NOTE : Not required for
020-100706-02 Rev. 1 (03-2014)
This