Christie M Series User Manual page 49

• No area of the screen appears more red, green or blue than another
• No area of the screen appears brighter than another
• Color and light output from one screen closely matches adjacent screens
Before you begin, read through the entire procedure before attempting to adjust Brightness Uniformity
controls, and keep in mind the following checklist of prerequisites and guidelines:
• Adjust Colors First—Always adjust the primary colors as described in Matching colors across
multiple screens on page 74 procedure, before attempting to work with Brightness Uniformity.
This ensures that primary colors, color temperature, and maximized light output are all well
matched from one screen to another. These matches are needed before you can achieve good
brightness uniformity results.
• Run Lamp For 100 Hours—Light output and brightness uniformity can vary significantly
during the first 100 hours of lamp use. For best results with new lamps, either set up
brightness uniformity after this period, or do an initial setup and re-check at 100 hours.
• Set Lamp Power—Ensure that each Lamp Power setting is as high as possible for your
application while still maintaining a good overall match of light output from screen-to-screen.
By nature, achieving a uniform brightness requires a slightly reduced overall brightness—this
reduction helps ensure that you have enough range of adjustment when examining brightness
variables more closely from screen-to-screen, and helps prevent premature maxing out when
trying to match to a certain color, zone, or projector.
• Use A user Color Temperature—Always adjust brightness uniformity for a User color
temperature defined when you matched primary colors, and continue to use it for all sources
displayed on the wall. Your other color temperatures will not necessarily be matched from
screen-to-screen.
• White Uniformity Slide Bars—White Uniformity slide bar values may not reduce to 0. Each
slide bar adjusts overall light output in a specific screen zone, but the value shown represents
the current setting for green in this zone. When other hidden values (red or blue) are lower
than green, during adjustment in the White Uniformity menu their values reach 0 first, causing
the slide bar to stop earlier than expected.
• Judge By Eye Or Use A Meter—Good brightness uniformity can be achieved with either.
Although the Brightness Uniformity control can be used for a stand-alone projector, it is particularly
useful for setting up and maintaining tiled images that form a cohesive display wall in which the color
cast and light output appear uniform throughout each image as well as throughout the entire wall. The
procedure provided here assumes a multiple-screen application.
1. To access a multitude of adjustments for light output control in specific areas throughout the
image, in the Brightness Uniformity menu, select Brightness Uniformity.
The settings apply as long as the Brightness Uniformity Enable check box is enabled.
To disable Brightness Uniformity, clear the Brightness Uniformity Enable checkbox.
2. To apply Brightness Uniformity settings with a large granularity, enable Coarse Adjustment.
Coarse Adjustment helps identify brightness changes and accelerates projector response time
while adjusting settings.
3. To ensure matched overall color temperatures and light output between screens, adjust
primary colors, double-checking that all whites and light output are well-matched.
4. Select the 13-Point test pattern for display, providing nine screen zones with 13 targets.
For best results, rather than examining the center of each zone when assessing Brightness
Uniformity adjustments focus on extreme edges.
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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