Microtek ScanMaker i700 User Manual page 53

White/Black Points tool
appear only when the cursor is on the histogram or if a slider is being
moved.
The Input value indicates the color value of the data displayed in the
histogram.
The Count value indicates the number of pixels at the Input value. If
Input value is 2 and Count value is 1300, then there are 1300 pixels
in the image at the Input value of 2.
The Percent value is the percentage of all pixels in the image where
color value is less than or equal to the input value. For example, if
Percent is 15% and Input value is 2, it means that 15% of all pixels
in the image have a value of 2 or less.
Channel
Channel lets you control the shadow and highlight settings for a particular
color channel (red, green, or blue), or for the Master channel (red, green,
and blue simultaneously).
Auto
The Auto button automatically judges the darkest and whitest points and
clips excessive black or white points. The clipping percentage of the
white/black points is accessible by clicking the Setup button.
Setup
This button provides you with advanced controls for setting the white/black
clipping points, as well as for determining the output levels for the
white/black points on your printer.
Using the White & Black Point tool:
1. Choose the Channel in which the histogram will be modified.
If your Image Type is RGB, select Master to modify the tone
curve in the red, green, and blue color channels of the image
simultaneously; or select the color channels individually (red,
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