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Calibrating the gamma or Tone Response Curve of the display during calibration will automatically correct for
any color deviations in shades of gray between black and white. This provides the best possible grayscale color
tracking.
Contrast Ratio
The Contrast Ratio of the display is the ratio of the measured Intensity to the measured Black Level. The Black
Level is the luminance or "brightness" of black when displayed on the screen. For LCD monitors the minimum or
native Black Level is typically fixed in ratio to the Intensity value due to the display technology.
NEC Display Wall Calibrator allows the Contrast Ratio to be selected for applications that require a specific contrast
ratio. However the calibrated contrast ratio can not be higher than the native contrast ratio, since the minimum Black
Level that the display can achieve is limited by the display technology.
The Contrast Ratio is adjusted (reduced) by increasing the black level as necessary.
For most applications the highest possible Contrast Ratio is most suitable and can be achieved by selecting Monitor
Default as the Contrast Ratio.
Specific Contrast Ratios in the range 50:1 to 500:1 can be selected.
Note: If the selected contrast ratio is higher than what the display is actually capable of achieving, then the display
will calibrate to the highest possible contrast ratio. For example if 500:1 is selected, but the display is only capable
of say 320:1 with the current Target settings, then the resulting calibration will have a contrast ratio of 320:1.
Calibration Steps
The display calibration process for a video wall when matching both the Intensity and White Point is outlined in the
following steps:
Initialize Displays - This step resets each display to the default color settings so that the "native" performance
1.
of each display can be measured before the calibration. Settings such as the Brightness, Color mode, Con-
trast etc. will be reset.
Measuring Displays - During this step, all displays are measured to determine the default "native" color char-
2.
acteristics of each display. This step involves placing the color sensor on the screen while various test patterns
are displayed and measured. This step repeated for all displays in the video wall.
Target Calculation - Once all of the displays have been measured the software will automatically calculate
3.
the maximum possible Intensity that will give a color match with all the displays. This is done by determining
the dimmest display in the video wall at the chosen White Point.
Calibrating Displays - Once the Target has been calculated, all of the displays can be calibrated. This step
4.
involves placing the color sensor on the screen while various test patterns are displayed and the display is
adjusted. This step repeated for all displays in the video wall.
Note: When calibrating to a Target that uses either Maximum Possible Per Display or Specific Level option for
the Intensity, steps 1 and 2 are optional because it is not necessary to measure and calculate the matching Target
value.
However if Specific Level is used, performing steps 1 and 2 will allow the software to verify that each display is
capable of achieving the specified Intensity value at the selected White Point. If a display can not achieve this, then
a yellow warning icon is shown in both the Summary window, and in the main display window for that particular
display.
NEC Display Wall Calibrator - UsEr's GUiDE | 1
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