Plustek V1.4 User Manual page 30

Chapter IV
Scan Mode
Line-Art (B/W)
(black and white). Use line-art for scanning text documents
created with a laser-jet, ink-jet or bubble-jet printer (no
photographs or other images).
Scan Mode
Resolution
Scan Scale
Brightness
Contrast
Grayscale captures more than two gray values during scanning.
When entering documents to your computer that contain
photographs, or other detailed pictures choose grayscale as the
scanning mode.
RGB Color captures the most information and detail during
scanning, and is the best choice for scanning pictures and
documents that contain detailed color and graphics.
20
comprises of documents that have only 2 values
Figure 5. Scanning Control Panel