The default (0) level sharpening was chosen by Canon to allow most moiré interference to be safely blurred to invisibility, at the cost of a little sharpness. A little softness is necessary (and is introduced by a blurring 'antialias' filter in front of the sensor) to reduce or eliminate the moiré effects that can result when details in your image form a pattern that is too close to the pattern, or frequency, of the sensor itself. When adjusting sharpness, remember that more is not always a good thing. You can adjust the sharpness of the image between values of 0 (no sharpening added) to 7 (dramatic additional sharpness). This parameter determines the apparent contrast between the outlines or edges in an image, which we perceive as image sharpness. Figure 3.23 shows exaggerated examples of the first four (color photo) attributes, as applied by Picture Styles (your real-world tweaks may not be quite this drastic, but lesser modifications are more difficult to represent on the printed page):

The parameters applied when using Picture Styles follow. Perhaps you'd like a setting with extra contrast for shooting outdoors on hazy or cloudy days. If you want soft, muted colors and less sharpness to create a romantic look, you can do that, too.

If you want rich, bright colors to emulate Velvia film or the work of legendary photographer Pete Turner, you can build your own color-soaked style. Better yet, you can use those three User Definition files to create brand new styles that are all your own. But you can adjust any of those 'canned' Picture Styles to settings you prefer. Canon has set the parameters for the five predefined color Picture Styles and the single monochrome Picture Style to suit the needs of most photographers.

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