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SilverFast
®
Manual
6. · Descreening
Manual USM in the Expert Dialogue
Advanced users can use the extensive expert mode in order to set
up optimal sharpening parameters. A click on the small "Expert button" in the dialogue window will elongate the window and offer additional setting possibilities. An additional click on the "Expert button" (which is now red) will bring the dialogue window back to its normal size. Additional parameters: ·
Over sharpening: Reduces the generation of disturbing arti-
facts at the edges. A value of "Zero" suppresses this generation
completely, but often delivers a seemingly artificial image. Low values (10 0) allow slight artifacts to appear, but the image appears more plastic and more natural. ·
Sharpening up to: will determine the percent value of the grey
value (0-100%).
A value of e.g. 80% means that all tones below 80% will be
sharpened. The dark tones between 80% and 100% will remain unsharpened. ·
Sharpen from (only in negative-mode):
Determines from which percentage (greyscale) sharpening will
take effect. (0-100%) A value of e.g. 0% means that all tones above 0% will be
sharpened. The lighter tones (negatives) from 0% to 0% again remain unsharpened. The slider ,,sharpen up to" / ,,sharpen from" is important to
prevent noise in images with shadows to become intensified by the USM. ·
Light Contour / dark Contour: depending on the desired
sharpness of the subject matter, one or the other value can be
intensified. In most instances the values are set the same. |