I.R.I.S. IRIScan Pro 3 Cloud Button Manager - Manual (Page 26)

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Brightness and Contrast
Brightness Adjusts the lightness or darkness of an
image. The higher the value, the brighter the
image. Drag the slider to the right or left to
increase or decrease the brightness. The
default value is 0. The range can be from
-100 to +100.
Contrast
Adjusts the range between the darkest and
the lightest shades in the image. The higher
the contrast, the bigger the different
grayscale. Drag the slider to the right or left
to increase or decrease the contrast. The
default value is 0. The range can be set from
-100 to +100.
Brightness: -50 Brightness: 0
(Normal) Brightness: +50
Contrast: -50 Contrast: 0
(Normal) Contrast: +50