Microtek ScanMaker 5, User Manual

Page: 43 / 68

4-20 ScanWizard Pro for Windows User’s Guide
English
Using the Tone Curve Tool
The Tone Curve tool is used to adjust the tonal
distribution of each channel of an image. It functions
very much like the Gradation tool, except that it
provides additional functions to allow separate
adjustments of the tones in each RGB or CMYK
channel, depending on the image type. This tool is
especially useful for correcting the “ink percentage”
distribution (i.e., dot gain correction) in CMYK
images.
In the example here, the original image looks cold, with
a decidedly blue-green cast to it. The solution:
Increase the “ink percentage” of the yellow and
magenta channels to bring out the warmer tones.
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 Tone Curve tool in the Settings window.
The Tone Curve dialog box will appear.
5. Select Curve as your “Method”.
6. Select Yellow as your “Channel”, and adjust the
yellow channel by moving the curve slightly
higher and towards the left, as shown.
7. Select Magenta as your next “Channel”, and do
the same thing you did with the yellow channel,
moving the curve slightly higher and towards the
left.
8. 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.
9. Click OK to confirm the correction.
Image corrected with Tone Curve tool
Original image