User`s guide

4-8 ScanWizard Pro for Windows Users Guide
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;
truncate or narrow the scanner’s range of density to
the actual 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 from the View menu.
4. Click the Dynamic Range tool in the Settings
window. The Dynamic Range screen will then
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.
NOTE: In the default Automatic setting,
ScanWizard Pro optimizes density capture range
automatically. You only need to use the Dynamic
Range tool if you wish to further enhance image
contrast.
Original image and
lightness histogram
without density
correction, showing
narrow tonal range
Using the Dynamic Range Tool
Corrected image and
lightness histogram with
density correction,
showing a broader tonal
range