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Latency of the display unit
The latency is a specification of the time that is needed to convert the input signal into light emitted
from the LCD panel, expressed in milliseconds (ms). The latency shown in the status bar is
determined by the time difference between the receipt of the middle line of the frame and the
output on the screen of the middle line of the same frame. This time already includes the latency of
the LCD panel.
Lightness
Lightness (CIE L*) is the standard approximation to the perceptual response to luminance.
Lightness is obtained from a non linear transformation of luminance.
⎧
Y
903
3 .
⎪
Y
⎪
n
=
⎨
L
*
1
⎛
⎞
⎪
Y
3
⎜ ⎜
⎟ ⎟
−
116
⎪
⎝
⎠
Y
⎩
n
Light output
The luminance that is emitted by the display unit expressed in cd/m
Luma
Luma (Y') is an engineering term that describes the non linear transformation of luminance to a
perceptual uniform space (not to be confused with lightness). Luma as a weighted sum of the
gamma corrected R', G' and B' components.
Luminance
Luminance (Y) is a measure for the amount of light that is emitted from the LCD panel. The units
2
are cd/m
, or lm/sr.m
LUT (3D)
In the film industry, 3D-LUTs (lookup tables) are used to calculate preview colors for a monitor. A
3D-LUT is a 3D lattice of output color values. Each axis is one of the 3 input color components and
the input color thus defines a point inside the lattice. Since the point may not be on a lattice point,
the lattice values must be interpolated.
Cubes may be of various sizes and bit depths. Often 17x17x17 cubes are used as 3D-LUTs.
Y
≤
;
. 0
008856
Y
n
Y
<
16
;
. 0
008856
Y
n
2
and is briefly called "nit".
2
.
Barco - RHDM-1701 - User manual
Terminology
165
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