Plustek 8100 - Инструкция по эксплуатации - Страница 26

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4-9. Descreening

Printed originals will always have a screen that 

is created during the printing process from the 

individual printer dots. When scanning with 

high resolution this screen can become visible 

and overlap with other screens to very annoying 

Moiré effects. The SilverFast Descreening can 

automatically detect and remove this printing 

screen.

•  If  you  know  the  printing  screen  of  your  original,  you 

can directly set it in the controls dock. Select the menu 

item “Custom“ from the “Screen“ menu and adjust the 

screen  in  lpi.  If  you  don‘t  know  your  originals  screen, 

select the menu item “Auto“ or a suitable default value.

•  Below you will find a slider that is for determining the 

threshold from which the descreening functionality is 

taking effect.

•  For  previewing  your  settings,  a  detailed  PreScan  of  a 

representative  image  section  is  required.  Therefore, 

click on the “1:1“ button.

4-10. SilverFast Multi-Exposure®

The Dynamic Range, i.e. the number of gray lev-

els of transparent originals can be so large that 

conventional scanners can not completely cap-

ture it. In this case image details are lost espe-

cially in the shadows. SilverFast Multi- Exposure 

increases the scanner‘s effective Dynamic Range 

by performing two scans with different expo-

sure times. These two scans are then merged to 

become the final enhanced image.

•  You  can  activate  and  deactivate  Multi-Exposure  by 

clicking onto the icon in the standard tools bar above 

the  preview  window.  Multi-Exposure  requires  more 

time  for  performing  the  scan,  but  in  return,  visibly 

improves the results.

4-11. iSRD® (infrared based Dust and Scratch

Removal)

Slides and negatives often have minor scratches 

or dust particles that can get very striking by the 

magnification of scanning. iSRD uses the scan-

ner‘s infrared channel to detect these defects, 

which an intelligent algorithm then removes 

from the image. SRD in contrast does not require 

an infrared channel.

•  Select “Automatic“  from  the “Correction“  menu  in  the 

iSRD dialog to use iSRD in automatic mode. If you want 

to  adjust  the  strength  of  defect  detection  yourself, 

select  menu  item “Correct“.  Use  the  slider “Detection“ 

below to adjust detection strength.

Multi-Exposure can only be ap-

plied to transparent originals. 

Not every scanner is capable of 

supporting Multi-Exposure. 

active

inactive

www.SilverFast.com/sf/Multi-Exposure

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