Image Type Button - Epson PERFECTION 1640 SU Reference Manual

This setting is useful when scanning characters-only documents
or line drawings without coloring.
Text (Background Removal):
Black and white, best quality, Text Enhancement Technology
This setting is for OCR (Optical Character Recognition).
Copy & Fax:
Black and white, hard halftone, draft quality, Auto Area
Segmentation

Image Type button

The Image Type button allows you to customize the Image Type
settings. If you want to make many detailed settings manually,
use this feature.
Click the Image Type button. The following dialog box appears.
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Understanding EPSON TWAIN Features