Avision DS320F (DF-0707S) - Manual (Page 26)

3-10
When the value of highlight and shadow change, the image changes
accordingly.
Highlight: 255/Shadow: 0(Normal) Highlight: 210/Shadow:10
Highlight: 200/Shadow:0 Highlight: 255/Shadow: 50
3.5.3 Adjusting the Brightness Curve
Adjusts the midtones of the image without dramatically
altering then lightest and the darkest areas.
When the curve is moved up or down, the image
turns brighter or darker.