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About Sharpness
A sharp image has clean, crisp edges. Sharpness effects local
areas which transition quickly from light to dark tones such as
the edge of a building against the sky or the edge of a line
against a white background. When these transitions occur over
a few pixels (1-2), the image appears sharp. When the transition
occurs over several pixels (3-10 or more), the image appears
fuzzy or blurred.
Sharpness control:
Sharpening re-establishes clear difference between adjacent
pixels (see right half of figure).
The sharpness control is particularly useful in enhancing pencil
lines or supporting suppressing paste up lines. Generally, text
looks better with more enhancement, while pictorials only
require moderate enhancement.
Figure 1
However, (the right half of the figure 1), while the right half is not
as blurry as the left half, too much sharpening has made the
image look grainy, and has caused the girl's complexion to
become uneven, or mottled.
For details on working with the sharpness control, see
Adjusting
Sharpness
.
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TIP:
Extremely high levels of sharpness tend to cause
'ringing' on edges which gives the image an artificial
appearance. Depending on the application, some
designers use this method to create a 'better than
original, very sharp focal point in the document.
TIP:
Extremely high levels of sharpness may amplify
moire. see
Removing Moire Patterns From Images
.
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