Avision AV3200C - Manual (Page 39)

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Curves
When you select the Curves button, a dialog box
appears that allows you to adjust the midtone of the image
without losing details in the lightest and darkest areas.
Select the Curve or Line button, depending on if you want a
curved or an angled setting. Place the mouse cursor over the
line, click the right mouse button, and drag the line to set the
curve you want.
Color Balance
When you select the Color Balance button, a dialog
box appears that allows you to adjust the color of the image
so that it comes close to that of the original.