NEC Display Wall Calibrator Guide de l'utilisateur télécharger pdf (Page 42)

42 | NEC DISPLAY WALL CALIBRATOR - USER’S GUIDE

White Point

White Point selects the Target white point for the calibration. Several popular industry standard White Point values,

such as 9300K and D65, are provided.

A custom white point can be specied by clicking the Edit... button to

open up the Custom Color Temperature dialog.

If the absolute highest possible Intensity is needed for an application

and the White Point does not need to be a particular value, then the

Calculate Highest Intensity White Point function can be used to

calculate the White Point that gives the highest overall Intensity. This

White Point value is calculated from the “native” or un-calibrated

measurements taken from all of the displays so all displays should be

measured before using this function. Clicking the Calculate Highest

Intensity White Point button will update the current White Point with

the calculated value.

Gamma Curve

Gamma Curve selects the desired tone response curve of the calibrated displays.

Options are:

• Monitor Native Gamma - No correction is applied and the display’s Look Up Tables are set to linear.

• Gamma Curve Value - The response curve will follow a simple gamma curve. Values between 1.0 and 3.0

can be entered. A gamma value of 2.2 is popular for most applications.

• DICOM Curve - The response curve follows the DICOM (Digital Imaging and Communications in Medicine)

specication. This response curve is aimed at medical use, however it can be used for other applications.

The goal of the DICOM response curve is to have a visually linear display response.

• Custom Curve - Advanced and custom response curves can be selected from presets or created by

importing a table of values. Click the Edit... button to open the Custom Gamma Curve dialog.

Note: The Custom Curve and DICOM Curve selections will not be available if the current Calibration Method is set to Use RGB

Gains in the Preferences.

Contrast Ratio

Contrast Ratio allows a particular contrast ratio to be used if necessary. The contrast ratio is the ratio of white to black

luminance.

Selecting Default will calibrate the display to the highest possible

contrast ratio, which is limited by the display technology, the

selected White Point, Intensity value, and other factors.

In some applications, for example simulating low contrast images

such as in newsprint, it is useful to have a lower contrast ratio than

the display’s native value. Contrast Ratios in the range of 50:1 to

500:1 can be selected.

The Contrast Ratio selection will not be available if the current

Calibration Method is set to Use RGB Gains in the Preferences.

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. If a specic Contrast Ratio is selected, it is recommended that the number of

Calibration and Measurement Steps be set to at least 32 in the Preferences dialog.

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NEC Display Wall Calibrator Guide de l'utilisateur Page 42