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Line c shows brightness thresholding and the result is an image with only black and white grey
levels. and line d applies a gamma correction (see also Section 5.5.2).
Figure 5.15: Commonly used LUT transfer curves
5.5.1 Gain
The 'Gain' mode performs a digital, linear amplification with clamping (see Fig. 5.16). It is
configurable in the range from 1.0 to 4.0 (e.g. 1.234).
300
250
200
150
100
50
0
0
Figure 5.16: Applying a linear gain with clamping to an image
MAN061 12/2018 V1.3
y = f ( x )
y
m a x
d
Grey level transformation − Gain: y = (255/1023) ⋅ a ⋅ x
200
400
x: grey level input value (10 bit) [DN]
c
b
=
x
x
0
1
600
800
5.5 Grey Level Transformation (LUT)
x
x
m a x
a = 1.0
a = 2.0
a = 3.0
a = 4.0
1000
1200
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