Custom White Point Dialog - NEC SpectraView II Guia Del Usuario

21 | NEC SPECTRAVIEW II - USER'S GUIDE

Custom White Point dialog

The Custom White Point dialog is accessed by clicking the Edit.. button in the White Point section of the Edit
Calibration Target dialog.
A custom White Point can be created by either specifying it as a Black Body radiator temperature in Kelvin, as CIE (xy
chromaticity) Coordinates, or by interactive visual adjustment and measurement.
Values between 2500K and 10000K may be entered in the Black Body K field. The corresponding CIE xy coordinates
are automatically calculated and displayed for reference.
CIE xy chromaticity coordinates can be entered by selecting the CIE Coordinates radio button and entering the x and
y values. The corresponding correlated black body radiator temperature and Δuv (Delta-uv) values are automatically
calculated and displayed for reference. The Delta-uv value indicates how far the xy coordinates entered are from the
black body radiator locus.
A custom White Point may be measured using the calibration sensor, and automatically entered in the CIE xy chromaticity
coordinate fields by clicking the Measure button. This is useful for "cloning" the white point of another monitor.
The color sensor can be placed over the white circle on the right of the dialog in order to take a measurement of the
white point by clicking the Measure button. The circle can also be used to visually compare the white point to another
reference such as a lightbox. If a larger area of white reference is needed, selecting White Screen Background will fill
the entire screen background with white.
The luminance and color of the display can be interactively adjusted to visually match a reference if necessary. To
interactively adjust the color of the display, click and drag within the color circle or use the arrow keys. Use the vertical
slider control to adjust the Intensity. Specific Red, Green and Blue values can also be entered.
Once a visual match is found, the adjusted white point must be measured by clicking the Measure button and measuring
the white circle with the color sensor. This will update the Target white point values with the new White Point values.
Note:
Due to the technology limitations of the color sensor compared to the human eye, for some applications, it is sometimes
better to visually match a white point using this interactive method, and then measure it using the color sensor.