Input Levels - Christie Entero RPMWU User Manual

Section 3: Operation
RGB Quantization Range
This control defines the RGB quantization levels for digital DVI and HDMI inputs using the RGB color space.
Typically, graphic sources use the full range of levels for the given bit depth (i.e. 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. As an example for 8 bit space, full range RGB uses
levels 0(black) to 255(white). A limited CE range is 16-235 for 8-bit video sources.

Input Levels

Only experienced users should use the
Input Levels submenu. The projector
automatically optimizes input levels for all
but the most unusual of sources. Before
starting, check that overall contrast and
brightness settings are near 50 and that color
temperature is properly set up on an internal
grey 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.
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.
For a source exhibiting overly high black levels (typically caused by a noisy source causing black level spikes)
use the Input Levels menu. These adjustments serve as a calibration process compensating for differences in
sources and cabling, and perfect the source image input levels to eliminate overshoot and undershoot.
NOTES: 1) Input Levels are of limited use with digital signals, but do offer some ability to tweak poorly
mastered source materials. 2) Input levels apply for the current source only, but for any color temperature
used. 3) 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
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 Input Drives
IMPORTANT: Do not use Input Levels to adjust color temperature. This will distort contrast and brightness
functions as well as color temperature.
NOTE: If color temperature is set up based on the internal test patterns, you can set up input levels for a given
source so that they match the color temperature of the internal test patterns.
3-24 Entero RPMWU/RPMSP/RPMHD-LED01 User Manual
020-100367-05 Rev. 1 (06-2012)