FUJITSU 32 - Manual (Page 70)

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♦ Contrast/Brightness (Color / Grayscale)
Contrast : Sets the contrast of light and shadow in a scanned image. Specify the contrast
with a number in the range of 1 (low [soft]) to 255 (high [sharp]).
If this value is increased, the dark part of the image is shown darker and the
light part is shown lighter.
Some scanner models do not support this function. See "Relevant Image
Scanner Specification" in Appendix.
Brightness : Sets the brightness of the overall image. Specify the brightness with a number
in the range of 1 (light) to 255 (dark). To darken the overall image, increase
the value of the setting. To brighten the overall image, decrease the value.
♦ Gamma (Color / Grayscale)
This option corrects distortions from nonlinear image representation. Scanner sensors are
generally designed to generate output linear to the density of the light reflected from the
document. However, most output terminals do not produce output that has the desired linear
relation to the input, and the resulting distortion must be corrected.
An arbitrary range is between 0.1 and 10.0.
♦ Preset Gamma (Grayscale only)
This option corrects distortions from nonlinear image representation. Scanner sensors are
generally designed to generate output linear to the density of the light reflected from the
document. However, most output terminals do not produce output that has the desired linear
relation to the input, and the resulting distortion must be corrected.
One of the following can be selected as a correction pattern: "Normal", "Soft", "Sharp",
"Download Pattern", or "Custom".
Some scanner models do not support this function. See "Relevant Image Scanner
Specification" in Appendix.