Guppy PRO Technical Manual
V4.1.2
98
This gamma LUT is used with all Guppy PRO models.
Gamma is known as compensation for the nonlinear brightness response of
many displays e.g. CRT monitors. The look-up table converts the incoming
12 bit
from the digitizer to outgoing
10 bit
.
Loading an LUT into the camera
Loading the LUT is carried out through the data exchange buffer called
GPDATA_BUFFER. As this buffer can hold a maximum of 2 KB, and a complete
LUT at 4096 × 10-bit is 5 KB, programming cannot take place in a one block
Figure 38: LUT with gamma=
0.45
Note
•
The input value is the most significant
12-bit
value from
the digitizer.
•
Gamma 1 (gamma=
0.45) switches on the LUT. After
overriding the LUT with a user defined content, gamma
functionality is no longer available until the next full
initialization of the camera.
•
LUT content is volatile if you do not use the user profiles
to save the LUT.
0
200
400
600
800
1000
1200
0
500
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3500
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4500
Output
Input
Output = f(input)
Gamma=0.45
