Set Gamma Correction - HikRobot CameraLink Area Scan Camera User Manual

4. Take Green as correction standard, and manually adjust other two channels (R channel and B
channel) to let these three channels have same value.
 Here we take Green as an example. For specific Balance Ratio Selector value, please refer to
the actual condition.
 In order to avoid repeated correction after rebooting the camera, it is recommended to save
white balance parameter to User Set after white balance correction. You can refer to Section
9.3 for details.
 If the light source and color temperature in environment change, you need to correct white
balance again.

8.12 Set Gamma Correction

The camera supports Gamma correction function. Generally, the output of the camera's sensor is
linear with the photons that are illuminated on the photosensitive surface of the sensor. Gamma
correction provides a non-linear mapping mechanism as shown below.
 Gamma value between 0.5 and 1: image brightness increases, dark area becomes brighter.
 Gamma value between 1 and 4: image brightness decreases, dark area becomes darker.
In the format of Bayer, the color camera does not have Gamma correction function.
There are 2 types of Gamma correction, including User mode and sRGB mode. You can set User
mode as shown below.
Steps:
1. Click Analog Control > Gamma Selector.
2. Select User as Gamma Selector.
CameraLink Area Scan Camera·User Manual
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0.9
0.8
0.7
Gamma=0.5
0.6
0.5
Gamma=1
0.4
0.3
0.2
0.1
0
0.2
0 0.1
0.3
Figure 8-18 Gamma Curve
Gamma=2
Gamma=4
0.6 0.7 0.8 0.9
0.4 0.5
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