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3.5 Adjusting Displays in a VideoWall
3.5.3 Matching the Colors
Color balance is the process of getting all the displays in a wall to show the same colors. It is done
with internal white and gray test patters. Never use Black and White Levels to try to achieve color
balance.
The object of color balancing is to make the
individual units show the same color when the
source image is the same. When we see a car
move from one side of the screen to the other,
we want it to be the same color for the whole
trip and not change from bright red to maroon
to orange as it moves from one display to the
next.
The panels show slightly different colors
from one unit to the next, because of slight
variations in the chemistry of the plasma
display material. This cannot be avoided, but we
can compensate for it with color balancing.
Color balancing is somewhat subjective. It
seems difficult at first, but it gets easier with
practice. Fortunately, you don't have to match
all the colors; you only have to match whites
and grays. When all the display units look the
same with a white image and look the same
with a 50% gray image, all the other colors will
be right.
CAUTION
Never try to match the colors of the
display units with the Black and White
Level controls or with the Video Controls.
We guaranty you will not like the results
if you do. And always use the internal
White and 50% Gray Test Patterns.
When you match whites or grays, you are
matching the color of these images. It is not
necessary to achieve a perfect white or a
perfectly colorless gray. It is only necessary that
all the displays look alike when they display
white and gray.
Color Balancing
1. Turn on all the units in the wall and let
them warm up for at least five minutes.
2. On each display, select Misc Controls
from the main menu. Then choose Test
Patterns and press
3. On each display, choose the White test
3 - 34
.
ENTER
pattern.
4. On each display open the Color Balance
menu by pressing the
the remote.
✎
Note: In this menu, the up-down arrow keys move
through both columns. The left-right keys
change the values. It is a common mistake
to try to move from one column to the other
with the left or right keys.
5. Adjust the Wht values of Red, Green and
Blue on all the displays to the maximum,
031. Adjust all the Gry values to their
middle value, 007. Then turn off all the
Color Balance menus by pressing
.
MENU
6. Look at all the display together. Stand far
enough away from the wall so you are
looking almost squarely at all of them.
You should not be so close that viewing
angle to the different panels varies a lot.
7. Find the darkest display. This display is
now as bright as it can be; you can't make
it brighter than this, so you will adjust all
the other displays to look like this one.
This is the baseline display.
8. Pick a display next to the baseline display,
and turn on its Color Balance menu.
Match the brightness of this variable
display to the baseline display.
• Match brightness first. Highlight the
two arrows under Wht. With the left
arrow button, reduce the brightness
until it matches the baseline display.
• Move the highlight down to the
individual colors and adjust the relative
amounts of Red, Green, and Blue in
the Wht column to achieve the best
match in color and brightness to the
baseline display. (See chart.)
9. When the first variable unit matches the
baseline unit, it becomes another baseline
button on
COLOR
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