Christie Mirage M Series User Manual page 63

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
= 50 (approx.)
RIGHT
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.
4. 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. Enable "Auto" in the Input Levels menu. Wait for all six values to
stabilize. Alternatively, do not use "Auto"—reduce black levels 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 Auto Color Enable option (described below).
5. 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.
• AUTO COLOR ENABLE
When a checkmark is present, selecting a specific black level or drive to adjust will automatically enable the
corresponding color in the display. Delete the checkmark to see all colors, or to enable a different specific color
through the Color Enable control.
• CLAMP LOCATION
Brightens the image produced from certain high-resolution high-frequency graphic sources. The projector
automatically selects the best clamp location for most sources. Use the normal Back Porch location if the
image is either sufficiently bright or overly bright. Select Sync Tip if the image appears unusually dim, if there
are horizontal streaks across the image, or if there is significant color drift. This moves the clamping pulse
from the normal back porch location (which is likely too short) to the tip of the horizontal sync pulse. Tri
Level is typically needed for an HDTV source.
Mirage M Series User Manual
020-100575-02 Rev. 1 (11-2010)
Input Levels are of limited use with digital signals, but do offer some ability to tweak
Input levels apply for the current source only, but for any color
2)
Assuming that color temperature has been set up based on the internal test patterns, you
3)
= 50 (approx.)
Not required for "Auto" adjustment.
Section 3: Operation
: Not required for
NOTE
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