Canon MP-C635 User Manual page 121

Now examine the components of a grayscale tone curve:
Curve Value
Highlights
Mid-tones
Shadows
As you drag the handles of the curve, you will see the values in the
associated fields change.
You can also type the numbers by clicking in the field you wish to
modify.
Acceptable values range from 0 (maximum darkness) to 100 (maximum
lightness) for each handle.
To locate a color range in the tone curve, move the pointer over the
specific area of your image and click while holding down the Option
key.
A line will appear on the tone curve corresponding to the area under
the pointer. In this way you can tell exactly where to make your
adjustments.
Changes made to the Master (gray) Tone Curve will automatically
modify the red, green, and blue channels.
Tone curves can be used to shift the overall color, brightness, and
contrast of a given scan in any direction.
Chapter 6
SHADOWS
Description
Lightest portion of the image
Part of the image between dark and light tones
Darkest portion of the image
Scanning With the MultiPASS C635
LIGHTER
DARKER
HIGHLIGHTS
6-15