Microtek ArtixScan M1 Pro User Manual page 34

The Dynamic Range tool is used to set the density
capture range of the scanner and displays the density
distribution (histogram) of the image to be scanned.
The Auto range (default) feature automatically
determines the Dmin (minimum density, lightest
tone) and Dmax (maximum density, darkest tone) of
the image, and sets the scanner capture range.
In the example here, the original image has low
contrast and a limited range of tones, as can be seen
in the narrow image histogram. The solution: To
narrow the scanner's range of density capture to the
density range of the image (or smaller). This would
then redistribute the small density range of the image
to the maximum range of the scanner output, and
thus restore contrast to the image.
1. Place the image to be corrected on your scanner.
2. Click the Overview button to start an overview,
and you will see the image appear in your
Preview window.
3. Select the area to be prescanned with the Scan
Frame tool, then click the Prescan button to
obtain a prescan image, and switch to the Prescan
view in the View menu.
4. Click the Dynamic Range tool in the Settings
window. The Dynamic Range screen will appear.
5. Adjust the Dmin and Dmax values to an
optimized range. To do this, move the sliders to
the boundaries on both ends of the histogram.
6. Click OK to confirm the correction.
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