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2.
Contrast
: Increase / reduce contrast (setting range -127...128, 0: neutral).
3.
Gamma
: Adjust the gamma curve (setting range 1...25, 17: neutral). This setting should
not be changed because the default value (17) perfectly matches the scanner's color
space.
4.
Background compensation
: This slide control is extremely useful if the background of a
scanned original is not really white. The white of paper normally does not correspond to
exact white in the RGB representation (setting range 0...255, 0: neutral).
In particular for photos you should set the background compensation carefully in
order not to lose any information (e.g. in color gradients). But also in drawings with
lines, information which is very bright can get lost. In case of doubt, simply check the
result in the Viewer.
5.
Sharpening
: By means of this slide control you can increase the sharpness of the image
(setting range 0...255, 0: neutral).
If you select a very high value, slight color fringes may occur at edges in the image.
6.
Smoothing
: By means of this slide control you can smooth angular structures in the
image (setting range 0...255, 0: neutral). In areas with fine structures, information may be
blurred.
7.
Black correction
: Similar to the brightening of the background on white you can turn very
dark areas into black if requested (setting range 0...255, 0: neutral).
8.
Interpolation
: If you want to use another resolution than that used for scanning, you can
set the requested output resolution, here. The image will then be interpolated to this
resolution.