Canon MultiPASS F20 Software User's Manual page 80

When you adjust the white-point, all tones in the image lighter than
the selected white-point are adjusted to white.
4. To return to the original setting, click Reset.
To save the histogram setting:
1. Click Save.
2. In the Save As dialog box, specify the file name and location where
you want to save the setting, and click Save.
To open a previously saved histogram setting:
1. Click Load.
2. In the Open dialog box, click the file name for the tone setting you
want to load and click Open.
To correct a common tone problem with a predefined tone curve:
1. On the Tone tab, click Special Tone Curves.
Chapter 4 Scanning 76