Canon CanoScan FB 620U ユーザーズマニュアル

Cause:

Moiré effect from scan of publication at high resolution (print screen lines
highlighted by optical interference, producing striped patterns).  The appear-
ance of this effect is dependent upon particular combinations of screen line
densities and scanning resolutions

Solution:

Rescan at different resolutions (See the ScanGear CS-U User’s Guide
electronic manual)

Cause:

Scanner employs an ultra-sensitive scanning unit that picks up ambient light if
document cover cannot stop light from entering around the edges of the book

Solution:

Cover the book and document glass with a dark cloth to prevent ambient
light from affecting the scan

Cause:

Resolution is set higher than necessary

Solution:

Lower the resolution.

Answer:

No

Answer:

No