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72 Advanced image processing

Amount: to adjust the contrast of the mask between 0%

and 500%. If the value is too high, pixilation will be appar-

ent; the image becomes noticeably rough or grainy. 150%

to 200% is recommended for high-quality printed images.

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 pre-

scan 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 output resolution 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.

Original image

With mask

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.

Radius: to increase the edge sharpness of the pixels. The

radius can be adjusted between 0.1 and 5. The default set-

ting is 1. Changes to the radius are more apparent on print-

ed images than images displayed on a monitor. A level of 1

to 2 is recommended for high-quality printed images.

Threshold level: adjusted in integers between 0 and 255. The default setting is 2. If the differ-

ence between the surrounding pixels is greater than the threshold level, that pixel is recog-

nized 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.

Konica Minolta DiMAGE Scan Dual IV User Manual

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