Avision DS320F (DF-0707S) - Manual (Page 25)

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3.5.2 Adjusting Highlight/Shadow Levels
Highlight refers the lightest point in a scanned image while
shadow refers the darkest point. Using Highlight and Shadow
tool together allows you to extend the range of color and reveal
more details in a gray or color image.
1. Shadow: The darkest point of an image.
2. Gamma: The midtones of the image.
3. Highlight: The lightest point of an image.
4. Pointer: Move the pointer to change the value.
When the value of gamma changes, the image changes accordingly.
Gamma Value: 1.0 Gamma Value: 1.4 Gamma Value: 2.0
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