Intensity; Contrast Ratio; Color Gamut - NEC SpectraView II Guia Del Usuario

44 | NEC SPECTRAVIEW II - USER'S GUIDE
A CIE Standard Illuminant is a defined white color based on a known light source. In SpectraView the D or Daylight
Illuminant series can be used to specify a white point. Daylight Illuminants are named according to their corresponding
correlated color temperature. For example, D50 is very close in color to a 5000K blackbody radiator.

Intensity

Intensity specifies the luminance or "brightness" of white when displayed on the screen. The maximum Intensity value
of the display will depend on the color temperature of the White Point selected, the type of monitor and its age.
The choice of Intensity value will depend on the application and viewing environment. If the display is being used in a
very bright environment and there is no visual reference (such as a proof in a lightbox), then the Intensity generally can
be selected to the maximum possible setting.
However if the display is being used in controlled lighting environment and there is a visual reference being used, then
normally a lower specific Intensity value is used. Using a specific value will allow the display to be calibrated to the same
value each time, provided it is within the capable range of the display.

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.
SpectraView 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.
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 you select 500:1, but the display only capable of say 320:1 with the
current Target settings, then the resulting calibration will have a contrast ratio of 320:1.

Color Gamut

The color gamut is the range of colors that can be displayed by the monitor. The color gamut of a monitor is defined and
bounded by the red, green and blue primaries which together make up all other colors.
Depending on the display model being used, the Color Gamut can be fully customized for specialized applications. See
the Color Gamut section for more information on selecting and configuring the Color Gamut.
The choice of Color Gamut will depend on the applications and operating system being used.
Typically if a color managed application is being used, then the Native (Full) color gamut should be used since this will
allow the application to make full use of the color capabilities of the display. This applies even if the image, document,
etc. is intended for another color gamut such as sRGB or AdobeRGB. The color gamut should not normally be set to
that of the color workspace of the application, if it is color managed. Likewise the color workspace should not normally
be set to the color gamut of the display.
For non-color managed applications a specific color gamut such as sRGB can be selected to make the display appear
as if it has such a color gamut. In this case, all of the necessary color conversions are done automatically within the
display.