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User’s Manual
4-15
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
Summary of Contents for AD280F
Page 1: ...Document Scanner User s Manual Regulatory model DL 1510B DL 1509B Avision Inc...
Page 24: ...User s Manual 3 6 5 Verify that the paper guides are aligned with the edges of the stack...
Page 39: ...User s Manual 4 5...
Page 48: ...User s Manual 4 14 Error Diffusion Image Dynamic Threshold Dynamic Threshold AD...
Page 51: ...User s Manual 4 17 Normal Photo Document Threshold 230 Normal Photo Document Threshold 230...
Page 63: ...User s Manual 4 29 The Compression tab dialog box...
Page 67: ...User s Manual 4 33 The Color Dropout dialog box...
Page 127: ...User s Manual 7 8 3 Close the reverse roller Cover 4 Close the ADF cover...
Page 136: ......