NEC GammaCompMD QA Manual de usuario descargar pdf (Pagina 179)

GammaCompMD QA Client User Manual

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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NEC GammaCompMD QA Manual de usuario Pagina 179