Operation Manual
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Section 4: Scanning and Opening Documents
Preprocessing Options
When scanning and opening documents, Readiris applies several Preprocessing options.
To access these options:
On the Readiris menu, click Preferences.
Click the Preprocessing tab.
The options you set here are applied as default to all the documents you'll open or scan. Note that
changing these options does not affect the images that are already open in Readiris.
Note that you can also access these options via the Settings menu.
Smoothen color and grayscale images
This option is activated by default. It renders grayscale and color images more homogeneous by
smoothening out differences in intensity. As a result, a stronger contrast is created between the foreground
(text) and background (artwork). Sometimes smoothening is the only way to separate text from a colored
background.
Remove dithering in black and white images
This option removes unwanted dither (noise) from black-and-white images.
Process as 300 dpi
Select the option Process as 300 dpi when you are processing images of an incorrect or unknown
resolution. The images will be processed as if they had a 300 dpi resolution.
Remove vertical lines
To remove vertical lines:
Select Remove vertical lines.
Enter values for the 3 parameters:
Minimum length: minimum length (in pixels) of the lines to remove.
Maximum thickness: maximum thickness (in pixels)of the lines to remove.
Maximum gap: maximum line gap (in pixels) to close, in case of broken, interrupted lines.