Plustek V1.2 User Manual page 32

gamma value, the brighter the colour becomes. Note: By
changing the gamma values you affect the image's data, and
influence the how an image displays on your computer's monitor,
and printer.
Figure 7. Gamma
Channels let you split a colour image into individual Hue,
Saturation, and Lightness channels. For example, each image
represents one of three additive colours (red, green, and blue).
The name of the channel appears in the title bar. This can be
useful in comparing colour ranges between the colour values, and
in identifying methods when editing specific areas.
Preferences
Use the Preferences option to change the unit of measure from
English (in.) to Metric (cm), or from Metric (cm) to English (in.).
Click Preserve Prescan , so the image displayed in the Prescan
window will not be removed after you close the TWAIN dialogue
box. This feature is extremely convenient if you are checking
scanned images for quality, proper filtering and/or scale.
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