Plustek V1.2 User Manual page 31

similar frequencies. Make adjustments to the histogram only
when the colour balance of your scanned image does not match
the original picture.
AUTO when not encountering colour depth discrepancies.
Tone Map enables you to modify the tonal range and to
adjust highlight, mid-tone, and shadow areas of an image. For
example: When an image is too dark or too light, it may have
hidden details that can be uncovered by using Tone Map. This
usually improves the contrast of an image. For example, when the
darkest tone is 65% black, you can use the Tone Map to make it
100% black.
Gamma values follow a smooth curve, as seen below in
Figure 7. By adjusting the gamma, you can change the tonal
range of the selected Channel (colour). Gamma values are
primarily a measure of a channel's brightness. The larger the
Hint: We suggest leaving the histogram set to
Figure 6. Histogram
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