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GammaCompMD QA Client User Manual
Copyright © NEC Display Solutions Ltd., 2006 -2015 179
15.3. How important is Reference Calibration?
Whenever any parameter in the Calibration Setup menu was changed and the display
configuration includes displays with integrated front sensors or retractable sensors,
a message pops up, as shown in as shown in Figure 146.
Figure 146: Reflected Luminance Setup dialog box
Reference Calibration is highly recommended to improve two items:
Color temperature matching of two or more Color Displays at the installation site
Automatic color temperature matching Color Matching in short - of two or more same
model color displays is now made possible by means of Reference Calibration. This requires
an external sensor as the common reference for all display sensors of a configuration.
For correct Color Matching, a common Color Chromaticity Target is required, as shown in
Figure 148:
- Set White Luminance Calibration Mode to i.e. “6500K, “7500K, “Clearbase or “8200”.
- Set the Chromaticity Tolerance limits (x,y) to “0.0025” and “0.0025”, min. “0.0015” and
“0.0015”
Figure 147: Example for Chromaticity Target settings
For good color matching results, is important to reduce the default Chromaticity Tolerance
limits (x,y) from “0.0040” to “0.0025 or even down to “0.0015. This narrows the allowed
sensor measurement tolerance, resulting in good color matching. However some physical
limitation to this automated approach exists: A trained human eye is more accurate to detect
color differences than any color sensor - as used for this purpose - ever can be.
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