Epson PERFECTION 1240U Reference Manual page 80

Click the Image Controls button on the Manual mode window
to view the following dialog box.
Note:
❏ The Image Controls button appears dimmed and is not available
when B/W Option is set to Text Enhancement Technology in
the Image Type dialog box.
❏ The Image Controls settings are optimized automatically when you
scan from the Full Auto mode.
❏ If Pixel Depth is set to Black & White and Halftone is set to None
in the Image Type dialog box, all the settings except Threshold
appear dimmed and cannot be selected.
❏ You can see the effects of the Image Controls settings in the Preview
window.
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Understanding EPSON TWAIN Features