User`s guide

Scanning from TWAIN
64 DocuMate 765 Scanner User’s Guide
Threshold—move the slider to the left or right to set the level of lightness
or darkness for the scanner to leverage from. This option is only enabled
if you have selected Text or Mixed Content as the threshold technique to
use.
For example, if you are scanning a document with gray text, such as
hand written pencil notes, move the slider towards Light. This tells the
scanner that the level to look for is light, and gray pixels are converted
to black pixels instead of white. If the overall tone of the original
document is dark, such as a colored background that may interfere
with detecting black, move the slider towards Dark. This tells the
scanner that the level to look for is dark, only very dark areas such as
text are converted to black pixels.
If you are scanning documents that are in good condition, with black
text on a white background, the default threshold option will properly
scan the item. This level only needs to be adjusted if the scanned
image does not have image clarity similar to the original.
Dither / Halftone / Error Diffusion Method—select the dithering type
you want to use from the drop list in the sub panel.
Below is an example of a color scan, a black and white scan without
dithering, and a black and white scan with dithering (using Bayer
Dither 64 steps). When the image is scaled down, it may look like a
grayscale scan. When the image is at normal size or enlarged you will
be able to clearly see the dithering pattern, as shown in the close-up
image.
Dynamic Threshold—move the slider to the left or right to set the level of
lightness or darkness for the scanner to leverage from.
For example, if you are scanning a document with gray text, such as
hand written pencil notes, move the slider towards Light. This tells the
scanner that the level to look for is light, and gray pixels are converted
to black pixels instead of white. If the overall tone of the original
Full Color Black and White Bayer Dither 64 Steps
Close-up of Bayer Dither