Konica Minolta DiMAGE Scan Dual III AF-2840 - Manual (Page 80)

Amount: to adjust the contrast of the mask between 0% and 500%. If
the value is too high, pixilation will be apparent; the image becomes
noticeably rough or grainy. 150% to 200% is recommended for highly
quality printed images.
Radius: to increase the edge sharpness of the pixels. The radius can
be adjusted between 0.1 and 5. The default setting is 1. Changes to the
radius are more apparent on printed images, than images displayed on
a monitor. A level of 1 to 2 is recommended for highly quality printed
images.
Threshold level: adjusted in integers between 0 and 255. The default
setting is 2. If the difference between the surrounding pixels is greater
than the threshold level, that pixel is recognized as a sharp subject
pixel. When the level is set to 0, the whole image is corrected. The
threshold level can separate smooth or even areas from edges and
detailed areas to be sharpened.
Shadow protection level: to limit the sharp subject pixels in the
shadows. The level can be adjusted in integers between 0 and 255.
The default setting is 16. When the luminance level is greater than
the shadow protection level, that pixel is recognized as a sharp
pixel.
Original image
80
Unsharp mask
The unsharp mask sharpens edges in the image without affecting overall image contrast. This
mask can be used with soft or slightly out-of-focus images. The effect of the unsharp mask is very
subtle, but makes a significant improvement to the overall appearance of the image.
Drag the sliders or enter values in the text boxes to adjust the
parameters of the mask. The full effect of the unsharp mask
cannot be evaluated in the prescan image. It can only be
judged in the final scan.
The result of the unsharp mask differs with image resolution.
Make several scans with slight changes to the settings until the
intended result is produced. Clicking the reset button restores
the default settings.
Click the unsharp-mask button to open the unsharp-
mask dialog box.
with unsharp mask
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IMAGE SCAN DUAL III UTILITY
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IMAGE PROCESSING