Canon EOS-1 - Manual (Page 27)

III. IMAGE QUALITY SETTINGS 27
the in-camera setting at Level 0 and apply sharpening during post-processing in a
computer. See Unsharp Mask .
Contrast & Saturation: With EOS-1 class digital SLRs, Contrast and Saturation can be
adjusted on a 5 step scale from -2 to +2, with the default setting at 0 (mid-scale).
Although neither of these settings directly affects the sharpness of an image, they can
very significantly affect its apparent sharpness and overall appearance. The camera’s
default settings are usually satisfactory for most shots, but higher or lower settings may
be preferable according to differences in personal taste, subject matter and lighting
conditions.
Color Tone: This is another setting that does not directly affect sharpness, but the color
tone setting can significantly affect the appearance of your digital images, especially if
they contain skin tones. Lower settings produce reddish tones, while higher settings
produce yellowish tones.