Christie J Series User Manual page 92

Section 3: Operation
WHAT IS BRIGHTNESS UNIFORMITY?
When used to refine screens already matched for their primary colors, see
Matching Colors in Multiple Screens
can create an exceptionally smooth screen in which:
• 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
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.
IMPORTANT! 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—
Matching Colors in Multiple Screens
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—
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—
still maintaining a good overall match of light output from screen-to-screen. By nature, achieving a uni-
form brightness will require a slightly reduced overall brightness—this reduction will help ensure that you
have enough range of adjustment when examining brightness variables more closely from screen-to-
screen, and will help prevent premature "maxing out" when trying to match to a certain color, zone or pro-
jector.

USE 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—
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 will reach "0" first, causing the slide bar to stop earlier than
expected.

JUDGE BY EYE OR USE A METER—
3-42
and overall light output, proper adjustment of Brightness Uniformity
Always adjust the primary colors as described in
procedure, before attempting to work with Brightness Uniformity.
Light output and brightness uniformity can vary significantly during the first
Ensure that each Lamp Power setting is as high as possible for your application while
Always adjust brightness uniformity for a User color temperature
White Uniformity slide bar values may not reduce to "0". Each slide
Good brightness uniformity can be achieved with either.
3.12 Using Multiple Projectors:
3.12 Using Multiple
J Series 1000W and 1200W User Manual
020-100706-02 Rev. 1 (03-2014)
Projectors: