Microtek ScanWizard Pro User's Guide

English
Using the Gradation Tool (LCH Mode only)
Original image
Image corrected with Gradation tool
4-12 ScanWizard Pro for Windows User’s Guide
The Gradation tool lets you adjust the midtones
(the mid-level grays) of the lightness channel “L”
of an image without altering the color itself. This
is because even with changes to the luminance or
lightness value, the chroma and hue values are
kept constant.
To prevent color images from losing saturation
when adjusting the lightness, ScanWizard Pro
provides a Saturation Range option. With this
option, colors outside of a given chroma range are
not affected by the manipulation of the gradation
curve.
In the example here, the original image is
underexposed, with the middle tones of the image
being too dark. The solution: Lighten the tones to
brighten up the image.
1. Place the image to be corrected on your
scanner.
2. Click the Overview button, 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 Gradation tool in the Settings
window. The Gradation dialog box will appear.
5. Move the pointer over the curve, and drag the
center of the curve to the left. This brighten
up the midtones of the image.
6. Check the Preview box so that the image in the
Preview window is updated with the latest
image correction. The update is done in the
background and so may take a few moments
to show.
7. Click OK to confirm the correction.