12 | MULTIPROFILER - USER’S GUIDE
Black Level
The
Black Level
slider and spinbox controls adjust the luminance of black on the screen and is set as an
absolute value in Candelas per square meter (cd/m²).
The Black Level, together with the Brightness setting determines the contrast ratio of the screen image. There
is a maximum limit to the contrast ratio of the screen, which is determined by the characteristics of the LCD
panel, in combination with ambient light scattering on the screen, which produces glare. Glare reduces the
perceived contrast ratio by raising the black level of the surface of the screen.
To achieve the maximum possible contrast ratio, set the Black Level control to 0.0 cd. The control will display
Minimum
indicating that the Black Level will be set by the SpectraView Engine to be as low as possible.
Set the Black Level to a non-zero value to set the Black Level to a specific value.
If the
Ambient Light Compensation
setting is currently enabled, then the Black Level control will factor in
the impact of the ambient lighting glare on the screen on the perceived black level and adjust the monitor
accordingly.
The Black Level control will indicate when the selected value can not be achieved:
Note: The
Ambient Light Compensation
is only updated whenever the Brightness, Black Level or Picture
Mode controls are changed. The monitor will not otherwise update the black level based on the ambient light
sensor reading.
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, however
it will reduce the contrast ratio of the monitor.
The reason for this reduction in contrast ratio is because the black level is being maintained
constant (it is a fixed property of the LCD panel once the minimum LCD CCFL backlight
level has been reached), but the white level is being scaled down - so the ratio of white
to black levels will be reduced.
Too Low
- Is shown if the current Black Level setting can not be achieved either
because:
a) The setting is lower than that of the characteristics of the LCD panel with the current
Brightness setting.
b) If
Ambient Light Compensation
is enabled, the setting is lower than that of the
combined ambient lighting glare on the screen and characteristics of the LCD panel with
the current Brightness setting.
In either case, increase the Black Level control level to a point where the warning icon
disappears, which indicates the display can achieve the current Black Level value, or set
the control to 0.0 cd to select the lowest possible Black Level.
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