Epson PERFECTION 1240U Reference Manual page 72

Note:
❏ Dropout is available only when Pixel Depth is set to 14-bit Gray,
8-bit Gray, or Black & White.
❏ Depending on the image you scan, you may need to adjust the
Threshold setting in the Image Controls dialog box to enable this
feature.
B/W Option:
Select from:
Text Enhancement Technology, Auto Area Segmentation,
or None.
Text Enhancement Technology (TET)
To improve recognition accuracy during OCR (Optical Character
Recognition) scanning, select this option. This function eliminates
the document background from scans.
Auto Area Segmentation (AAS)
To make grayscale images clearer and text recognition more
accurate, select this option. This function separates text from
graphics.
Note:
❏ B/W Option is available only when Pixel Depth is set to Black &
White.
❏ When you need neither TET nor AAS, select None.
Halftone:
Select a halftone or dither setting to reproduce images using
special dot patterns:
3-12
Understanding EPSON TWAIN Features