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User's Guide

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12 | NEC MULTIPROFILER - USER’S GUIDE
Brightness
The Brightness slider and spinbox controls adjust the monitor brightness. The brightness is indicated in Candelas
per square meter (cd/m²) and represents an absolute value. The SpectraView Engine automatically calculates and
compensates the brightness value as color settings such as white point are changed.
The Brightness control will indicate when any range limits have been reached that impact the screen performance:
Too High
”Too High” is shown when the Brightness level setting is too high and cannot be achieved by
the monitor with the current setting. Lower the setting until the message disappears. It takes
several seconds to update the level warning.
Note: The monitor takes a few minutes after powering on for the maximum brightness to stabilize.
Uniformity
“Uniformity” is shown when the Brightness control is set above the range that the monitor
can achieve with the current Digital Uniformity Compensation setting.
In this case the monitor will automatically reduce the Uniformity correction level in order to
achieve the brightness setting level.
See “About Digital Uniformity Correction” on page 21 for more information.
Reduced CR
”Reduced CR” is shown when the Brightness control is set to a level where it impacts the
Contrast Ratio of the screen image. This occurs when the brightness setting is below that
which can be controlled using the LCD CCFL backlights alone.
When this range is entered, the monitor will automatically begin to reduce the brightness to
the requested value by using the internal 14-bit LUTs to scale the video signal. Since this
scaling is done internally to a high bit depth, it will not introduce color banding. It will, however,
reduce the contrast ratio of the monitor.
This reduction in contrast ratio is due to the black level being maintained as a xed property,
or constant, of the LCD panel once the minimum LCD CCFL backlight level has been reached.
Since the white level is being scaled down, the ratio of white to black levels are reduced.