Recognition quality depends greatly on the quality of the
scanned image. You can improve the image quality by altering the
main scanning parameters: resolution, scan mode and brightness.
The main scanning parameters are:
Resolution - use 300 dpi resolution for regular texts
(font size 10 pts or greater) and 400–600 dpi resolution for texts
set in smaller font sizes (9 pts or less).
Scan mode -
black and white.
Black and white scanning maximizes scanning speed but may result in
the loss of some character information. This may lower recognition
quality in documents of medium and low print quality.
Scan mode
- color.
Select this mode for documents that contain pictures, colored text
or colored backgrounds, so that you can retain the original colors.
In all other cases, gray scan mode is preferable.
Brightness - a medium brightness value of around 50%
should suffice in most cases.
Some documents scanned in black and white mode may require
additional brightness tuning.
Note: Scanning at 400 to 600 dpi resolution (instead of
the default 300 dpi) or scanning in grayscale or color (instead of
black & white) mode takes more time. Some scanners may take up
to four times longer to scan at 600 dpi than at 300 dpi.
To set scanning parameters:
To scan images using the ABBYY FineReader TWAIN
interface, click the Scanner
Settings button on the Scan/Open tab in the
Options dialog (menu Tools>Options). The
Scanner Settings dialog will open. Select the appropriate
scanning options from the dialog.
If you wish to scan your images using the TWAIN–Source
interface, your scanner's TWAIN dialog will open automatically
when you click the 1–Scan button. Set the scanning
parameters in the dialogue. Scanning options may have different
names depending on the scanner model. For example, for brightness
the word "threshold", a "sun" symbol or a black and white circle
may be used. Consult your scanner documentation for a full
description of available options.