User
’s Manual
7-11
Dynamic Threshold
Dynamic Threshold (AD)
Threshold
Used to convert a grayscale image to a
bi-tonal image. The value ranges from 0 to 255. A low
threshold value produces a lighter image, and can be used
to subdue backgrounds and subtle, unneeded information.
A high threshold value produces a darker image, and can
be used to help pick up faint images.
Adjust the threshold setting by dragging the Threshold
sliding bar to the left or right to achieve the desired
threshold setting.
200 dpi,
Threshold:50,
Brightness: 0
200 dpi,
Threshold:100,
Brightness: 0
Gray
Document Type: Choice: Normal, Photo, Document
Three options of document type are provided when you choose Gray as the image type for
your scanned document.
Choice: Normal, Photo, Document.
Document:
Choose Document if your original contains pure text or a mixture of text
and graphic since it is an optimal setting for regular business document. When using
Document, only Threshold can be adjusted.
Photo:
Choose Photo if your original contains photo to reproduce your photo in vivid
grayscale image. When using Photo, no Threshold and Contrast can be adjusted.
Normal:
When using
Normal
, Threshold, Brightness, and Contrast can be adjusted.
Threshold:
The value ranges from 0 to 255. The default is 230. A low threshold value
produces a lighter image, and can be used to subdue backgrounds and subtle, unneeded
information. A high threshold value produces a darker image, and can be used to help pick up
faint images. Adjust the threshold setting by dragging the
Threshold
sliding bar to the left or
right to achieve the desired threshold setting.