User manual

Processing Documents Defining the Source of Page Images 28
Scan black and white
Select this to scan in black-and-white. Black-and-white images can be scanned and
handled qu
icker than others and occupy less disk space.
Scan grayscale
Select this to use grayscale scanning. For best OCR accuracy
, use this for pages with
varying or low contrast (not much difference between light and dark) and with text
on colored or shaded backgrounds.
Scan color
Select this to scan in color. This will function only with color scanners. Choose this
if you want colored graphics, texts or backgrounds in the output document. For
OCR accuracy
, it offers no more benefit than grayscale scanning, but will require
much more time, memory resources and disk space.
Brightness and contrast
Good brightness and contrast settings play an important role in OCR accuracy
. Set these in the
Scanner panel of the Options dialog box or in your scanner’s interface. After loading an
image, check its appearance. If characters are thick and touching, lighten the brightness. If
characters are thin and broken, darken it. Then rescan the page. If your scanning results are
still not satisfactory, open the scanned image in the Image Enhancement window to edit it
using a range of different tools.
Scanning with an ADF
The best way to scan multi-page documents is with an Automatic Document Feeder (ADF).
Simply load pages in the correct order into the ADF. You can scan double-sided documents
with an ADF. A duplex scanner will manage this automatically.
Scanning without an ADF
Using OmniPage’s scanner interface, you can scan multi-page documents efficiently from a
flatbed scanner, even without an ADF. Select Automatically scan pages in the Scanner panel
of the Options dialog box, and define a pause value in seconds. Then the scanner will make
scanning passes automatically, pausing between each scan by the defined number of seconds,
giving you time to place the next page.