User`s manual

86 Microtek ScanWizard Pro for Mac OS X
The W&B Points dialog box in Native color mode
In Native color mode, the White & Black Points dialog box
allows you to modify the histogram in your RGB, CMYK, or Lab
channel. Channels can be modified individually or collectively
(when you select "All") in the Channel box.
Following the selection of your channel, you can move the black
and white sliders below the histogram to set the shadow and
highlight values, respectively. The edit boxes below the sliders
will reflect those values.
Channel box
Sliders
Edit boxes for shadow &
highlight values