Canon MultiPASS F20 Software User's Manual page 111

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To automatically adjust color levels (Truecolor, 256 Grays image types):
On the Adjust menu or toolbar, click Auto Levels.
The system automatically adjusts the color level for better viewing with
your computer monitor or other output device.
To manually adjust color levels (Truecolor, 256 Grays image types):
1. On the toolbar or Adjust menu, click Levels.
In the Levels dialog box, the original image appears on top. As you
modify the image, you can see the results on the bottom.
2. Move the sliders to the left to decrease, to the right to increase. Or,
enter the desired value in the appropriate box.
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Chapter 5
When you adjust the lightness, you adjust the brightness of the
color. A color with 100% lightness is always pure white, and a
color with -100% lightness is always pure black.
When you adjust the black point and white point levels, you
specify what you want the darkest and lightest points in the
range to be when you change the brightness and contrast.
Viewing and Enhancing Images 107