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Barco - RHDM-2301 - User manual 161
Terminology
Black body locus
Line in the x,y color space that determines the color of the light that is produced by a perfect black
body radiator at different temperatures.
Black level
The black level is the amount of light that is emitted by the LCD panel when it displays code 0. The
black level is the minimal achievable light output technically possible by the LCD panel.
Clipping
Clipping occurs when a transformation pushes the video signal out of the available driving range of
the LCD or the backlights. Clipping can occur in the highlights when the background is set too high.
Clipping in the lowlights can occur when the background is set too low.
Color working space
The color space is the full range of all different colors that are observable by humans. The color
space is determined by the tristimulus variables X, Y and Z or with corresponding R, G and B
values. The color space is often represented in a CIE[x,y] 2-dimensional chromaticity diagram.
Color sub-sampling (chroma sub-sampling)
Color sub-sampling refers to the number of bits that are available to represent the Luma and the
Chroma of each pixel in 2x2 array. The notation 4:2:2 means that of the 2x2 pixels, each has a
different Luma sample (4 samples), and that C
b
(C
r
) samples are the same two by two (the C
b
and
C
r
value changes every two pixels).
Gamut
The gamut is a set of colors in the X,Y,Z color space that can be generated by the display unit. In
the 2-dimensional x,y section, the gamut consists of all colors within a triangle defined by the three
primaries (red, green and blue).
Headroom
The headroom is defined as the region of the signal input code that exceeds the value of reference
white. For 10 bit signals, the headroom is defined between level 940 and level 1019.
Hue
$
The hue control is similar to the hue setting on a CRT display unit. Hue affects the C
B
and C
R
components of the Y’C
B
C
R
according to the following formula: