FUJITSU 32 - Manual (Page 61)

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The options are described below:
4.8.1. Gray
Figure Advance dialog (Gray)
♦ Gamma Pattern
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.
When "Download Pattern" is selected, the above dialog box opens.