Manually Optimizing Input Levels - Christie M Series User Manual

• Sampling Mode—Sets the color sampling mode for a digital signal to either YCbCr 4:4:4,
RGB or YCbCr 4:2:2. The proper sampling mode is determined automatically by the
projector; you can override this setting.
• Film Mode Detect—Enables or disables film motion detection. This is only available for
interlaced or segmented frame sources.
• Chroma/luma Delay—Affects any incoming composite or S-video signal, delaying the
luma signal (intensity) in relation to the chroma (color). In the image, increasing the luma
delay moves luma (seen as a shadow where colors overlap) to the right slightly, with
colors remaining in place. Decreasing this delay moves the shadow slightly to the left. If
necessary for your current source, adjust so that no shadows occur with adjacent colors.
• Split Screen—Allows a snapshot of the main image to be presented on the right side or
lower part of the screen for evaluation of advanced image processing features. All resizing
controls are honored on both images. However, image processing controls such as, Detail,
Sharpness, Noise Reduction and Adaptive Contrast only happen on the left side or top
image. Changing inputs, channels, or test patterns disables this control.
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 (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 optimizing input levels

Adjust the input levels of a source exhibiting overly high black levels, typically caused by a noisy
source causing black level spikes.
Because the projector automatically optimizes input levels for all but the most unusual of sources, we
recommend that 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.
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 they match the color temperature of the internal test
patterns.
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.
1. Select Image Settings.
2. Select Input Levels and change the following options:
M Series User Guide
020-101948-02 Rev. 1 (08-2018)
Copyright 2018 Christie Digital Systems USA, Inc. All rights reserved.
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Adjusting the image
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