Output Levels; High And Low Value Markers - Microtek ArtixScan 4500t Reference Manual

B. Output Levels
The Minimum Output Level lets you set the minimum output level of the black
point. The higher the percentage value, the lower the contrast will be.
The Maximum Output Level lets you set the output level of the white point. The
lower the percentage value, the lower the contrast will be.
C. High and Low Value Markers
This lets you set the High Value (shown as a black circle) and Low Value
Markers. The High Value Marker is shown as a black circle in your preview
image, while the Low Value Marker is shown as a white circle. You can specify
the range of the markers to either the entire preview (by selecting the "Overview
or Preview image" option) or to only within the scan frame (by selecting the
"Current Scan Frame").
In the White/Black Points Setup window, clicking the "Preview" button will
obtain instant results; clicking the "OK" button lets you exit from the Setup
window and applies the High and Low Value Markers setting you have made to
the preview image.
28 Microtek ScanWizard for Macintosh