Christie M Series User Manual page 43

• Auto Input Level—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 check mark, wait for the six slide bar values to stabilize, then delete the check
mark and exit. The Auto Input Level is automatically turned off upon exit from the Input
Levels Menu. 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.
• Black Levels And Drives—Do not use Input Levels to adjust color temperature. This
distorts contrast and brightness functions as well as color temperature.
a. Ensure overall Contrast and Brightness settings are set to near 50.
This is not required for Auto adjustment.
b. Check the color temperature setup using an internal grey scale test pattern, making
sure to obtain a neutral grey scale. This is not required for Auto adjustment.
c. 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 grey scale is
recommended.
d. 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. In the Input Levels menu enable
Auto. 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.
e. Clear the Auto checkbox and leave the Input Levels menu.
• Auto Color Enable—When selected, setting a specific black level or drive to adjust
automatically enables the corresponding color in the display. To see all colors, clear the
checkbox 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.
If the image appears unusually dim, has horizontal streaks across it, or has significant
color drift, select Sync Tip. 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.
• Input Peak Detector—A tool to assist with defining individual input levels, enabling you
to accurately set the Input Levels for any particular source with the appropriate image.
Enabling the Peak Detector activates a special operating mode for detecting only pixels
that are considered black or white—all other levels are displayed as a mid-level grey.
When used with a smooth grey scale pattern in which black and white are known to be at
opposite edges of the image, you can watch these isolated areas while adjusting individual
black levels and input drives until both black and white edges are just visible and
distinguished from neighboring pixels. Images from this source display correct blacks and
whites without crushing.
a. Display a 16 level grey scale test pattern from the required external source, and
select Input Peak Detector.
The Input Peak Detector initially renders the grey scale as a uniform grey field before
adjustment or extreme crushing.
b. Display one primary color. To ensure the correct color is displayed for each setting,
select Auto Color Enable.
M Series User Guide
020-101948-02 Rev. 1 (08-2018)
Copyright 2018 Christie Digital Systems USA, Inc. All rights reserved.
©
Adjusting the image
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