Adjusting the image
Mirage M Series User Manual
94
020-101942-02 Rev. 1 (10-2018)
Split screen cannot be used in conjunction with either PIP or Tiling. Both PIP and Tiling must be
disabled prior to enabling Split Screen control.
•
RGB Quantization Range—
Defines the RGB quantization levels for digital DVI and HDMI
inputs using the RGB colors pace. Typically, graphics sources use the full range of levels for the
given bit depth (such as 8-bit, 10-bit, 12-bit) and consumer electronics (CE) products typically
use a limited range of data within the given bit depth. This control must be set to limited to
correct the levels for those CE products that use the limited space. This adjusts what is
considered black and white levels in the image; for example for an 8 bit space, full range RGB
uses levels 0(black) to 255(white).
Manually optimize input levels
Because the projector automatically optimizes input levels for all but the most unusual of sources,
Christie recommends only experienced users use the Input Levels submenu. Before beginning,
check that overall contrast and brightness settings are near 50 and that color temperature is
properly set up on an internal gray scale test pattern.
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. 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.
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.
Input Levels are of limited use with digital signals, but do offer some ability to tweak poorly
mastered source materials. Input levels apply for the current source only, but for any color
temperature used. 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.
•
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 both set to near 50.
Contrast
= 50 (approx.)
Bright
= 50 (approx.)
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.
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