Canon DR-S130 User Manual page 78

When you want to reduce the moire patterns that appear
when color photos in magazines and other documents are
scanned at low resolutions
Setting [Moire Reduction] on the [Image control] tab sheet allows you
to reduce the moire patterns that are generated when color photos are
scanned at low resolutions.
Click [Image processing], and then configure moire reduction settings
in the dialog box that appears.
Hint
Moire reduction is enabled when the resolution is 300 dpi or less, and
[High Quality Moire Reduction] is displayed when the resolution is
240 dpi or less.
78