Christie Digital Systems CSP70 user manual Achieving Brightness, Uniformity

	Section 3: Operation
Achieving Brightness	' WHAT IS BRIGHTNESS UNIFORMITY? When used to refine screens already matched for
Uniformity	their primary colors (see Matching Colors in Multiple Screens, above) and overall
	light output, proper adjustment of Brightness Uniformity 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.
	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 the
	“Matching Colors in Multiple Screens” procedure (above) 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—Make sure 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
	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 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 SLIDEBARS—White Uniformity slidebar values may not
	reduce to “0”. Each slidebar 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 slidebar to stop earlier than expected.
	JUDGE BY EYE OR USE A METER—Good brightness uniformity can be achieved
	with either.

RPMSP & CSP70-D100U User’s Manual 3-53