Microtek ScanMaker 5 User's Guide Page 133

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Reference: The Settings Window 6-55
White/Black Points tool
For color and gray images, this tool allows you set white/black points; for line-
art image, it carries out threshold adjustment feature.
The White/Black Points dialog box
(Color/Gray image)
Histogram
The histogram is obtained from the scanned image material in the current
frame. The darkest pixels are at the left, and the lightest pixels are at the right.
An image with good contrast will have a histogram with vertical lines spread
across the scale from left to right. To change the white/black points, move the
two triangles below the histogram.
Channel selections are available for selecting respective color channel, or
selecting them all. Channel selections are accumulative, even though you select
both the “All” and the respective channels, the final effect is the “all” channel
plus the R, G, B, three channels. It is advisable to select either All or individual
R/G/B, not both.
Histogram
Auto
Sliders
Pickers
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