Plustek Opticpro A320E Flatbed Scanner - Manual (Page 59)

TWAIN Help 24
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Threshold sets the color level for converting an image to line art, which can
adjust the quality of line art image or eliminate unwanted dots in the documents
to improve OCR accuracy.
The following options are available from the drop-down list:
· Basic
You may adjust the Threshold value either way:
· Slide the thumb of the scroll bar to the right or left to decrease or increase
the Threshold value.
· Click the arrow signs on the right and left ends.
The current value is shown to right of the scroll bar.
· Advanced
You may adjust the Radius / Weight value either way:
· Slide the thumb of the scroll bar to the right or left to decrease or increase
the value.
· Click the arrow signs on the right and left ends.
The current value is shown to right of the scroll bar.
· Auto
This option will have TWAIN automatically apply optimal threshold value to your
scanned images.
Default
Clicking the Default button on the lower right corner revert the settings to its
original values and discard all adjustments you have made.