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WN-5230-S VideoWall User’s Guide
49
is having to the overall image. Then back off to fine tune. This helps to give
an intuitive feel for the color balance process.
It is often helpful to switch between the internal white and gray patterns and
actual video images to fine tune the system. Avoid making major changes
when adjusting to the video images because this can throw off the white or
gray balance. Remember also that the Input Level adjustment has a large
effect on color. If Input Level adjustments have not been made, color balance
for live video will be difficult. However, you may adjust Color Balance before
or after you do the Input Level adjustment. They do not affect each other –
that is, an adjustment in Color Balance does not affect the Input Level
adjustment, and vice versa – but they must both be adjusted properly for the
screens in the cube to match in color, luminance and black level.
Do not adjust Color Balance with Red, Green and Blue test patterns. This is
a method sometimes used with CRT displays, and it will not work with these
Clarity displays. The primary colors have been matched at the factory. If you
get the whites and grays to be the same over a whole wall, all the other
colors will be the same, too.
After you have color balanced all the units, save the settings for each unit. It
does not matter which source-mode combination you save, because color
balance data is saved once for all sources and modes. You should not have
to color balance the displays again until you change a lamp. However, lamps
near the end of their life may begin to change color, so it is a good idea to
check color balance occasionally.
Note: Setting the Gray color balance levels near 004 or 003 will often give
improved performance when the primary program source is composite or
S-video. To try this, reduce the overall brightness of the gray baseline cube
to these levels in the Gry column. Adjust this baseline cube to have the least
amount of color in the 50% gray field. Then balance the other cubes to this
one.