I.R.I.S. IRISPen Executive 6 for Mac - Manual (Page 41)

C HAPTER 4 - B ASIC PARAMETERS
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Automatic brightness is set by default. You should leave this
default setting for all normal documents.
Manual
When dealing with bad quality documents, changing manually
the brightness level may level the quality of the black&white
image and so improve the text recognition.
To set the brightness manually, click Manual, then slide the
indicator to the left (lighten) or to the right (darken). When you
darken the image, more pixels become black in the black-and-
white image; when you lighten the image, less pixels become
black.
Despeckle
The option Despeckle makes it possible to remove small spots
from the images. By default, the option is turned off.
To activate the despeckling, slide the indicator to the right. You
can remove dots from 1 to 20 pixels.
! Caution:
Be careful not to erase spots that are too big, otherwise you may
start erasing the dots on the letter "i", portions of dot matrix
letters, etc.