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NEC Display Wall Calibrator - UsEr's GUiDE |
Contrast Ratio – The ratio of the white luminance (Intensity) and black luminance (Black
Level) of the display.
Correlated Color Temperature – The closest matching color, expressed in Kelvin, of a white
point that does not lie exactly on the blackbody locus.
D Illuminants – CIE Daylight Standard Illuminants based on approximating daylight. The
subscript denotes the correlated color temperature of the illuminant. For example, D50 has a
correlated color temperature of 5000K.
Delta-E (Δ-E) – A measurement of how different two colors are to each other. In NEC Display
Wall Calibrator, Delta-E values are derived by calculating the distance between two colors in
Lab color space using the CIE 94 formula. A Delta-E value of 1 indicates a just perceptual dif-
ference between two colors.
Delta-uv (Δ-uv) – A measure of how different two colors are, irrespective of luminance. In NEC
Display Wall Calibrator Delta-uv values are used to indicate how far a white point is from the
blackbody locus. CIE uv color space is used instead of CIE xy because it is more perceptually
uniform or linear.
Device Gamut
The range of colors that a device can produce.
–
DICOM – Digital Imaging and Communications in Medicine.
Foot Lamberts (fL) – A unit of luminance. One foot Lambert is equal to 1 Candela per meter
squared divided by 10.76/π (approximately 3.43) .
Gamma – The relationship between the input video signal to a display monitor and the screen
output luminance. Typically the screen luminance follows a mathematical power function of the
input video signal, the exponent of which is called the gamma.
Gamut – The range of colors that can be reproduced on a particular device such as a monitor
or printer, or that can be distinguished by a sensing device such as a scanner or the human
eye.
Hue – The basic attribute of color such as red, green, yellow, blue or purple.
Intensity – Intensity specifies the luminance or brightness of white when displayed on the
screen.
IP – Internet Protocol.
Kelvin – An absolute temperature scale denoted by K. Zero Kelvin (0K) is equivalent to –273°
Celsius.
Lab – (See CIE Lab)
LAN – Local Area Network
LCD – Liquid Crystal Display.
Luminance – A measure of the brightness or intensity of light, usually expressed in units of
Candelas per meter squared (cd/m
) or foot Lamberts.
²
Look Up Table (LUT)
A table used to translate input values to output values. NEC Display
–
Wall Calibrator displays use 10 bit internal LUTs to apply Gamma corrections and Tone Re-
sponse Curves.
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