I.R.I.S. IRIScan Pro 3 Cloud Button Manager - Manual (Page 36)

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Normal Use ICC Profile

Gamma: Adjusts the midtones of the image without
dramatically altering the lightest and the darkest areas.
When the value of gamma changes, the image changes
accordingly.
Gamma Value: 1.0 Gamma Value: 1.4 Gamma Value: 2.0

Highlight and Shadow: 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.