AVer SF2111H-DVR user manual - Manual (Page 51)

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System > Image > Preference
In Preference tab, you can tune the IP camera white balance, change the video orientation, and adjust
the brightness and contrast.
White Balance: Adjust white balance value.
Video Orientation: To Flip or Mirror the video on screen.
D-WDR: This function is able to reduce the contrast in the view to avoid the dark zones resulting
from over and under exposure.
Adjust “Brightness”, “Contrast”, “Hue”, “Saturation” to get clear video.