User’s Manual
4-16
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.
Summary of Contents for AD340GN-AEG
Page 1: ...Sheet fed Scanner User s Manual Regulatory model FF 2009B Avision Inc ...
Page 52: ...User s Manual 4 5 ...
Page 61: ...User s Manual 4 14 Error Diffusion Image Dynamic Threshold Dynamic Threshold AD ...
Page 64: ...User s Manual 4 17 Normal Photo Document Threshold 230 Normal Photo Document Threshold 230 ...
Page 77: ...User s Manual 4 30 The Compression tab dialog box ...
Page 81: ...User s Manual 4 34 The Color Dropout dialog box ...