Avision BT-1007B, Руководство пользователя

Страница: 39 / 110

User’s Manual
4-15
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.