Avision AV610 - Manual (Page 28)

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3.2.2 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.
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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.
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