Canon 2925B002 On-Screen Manual page 124

Scan Settings Dialog Box
Important
When you select Auto Detect, the image may not be scanned at the correct position and size. In
that case, change the size to the actual document size (A4, Letter, etc.) and align a corner of the
document with the corner at the arrow of the Platen.
See " Placing Documents
Scanning Resolution
Select the resolution at which to scan documents. The following scanning resolutions can be
specified:
When Document Type is other than film: 75 dpi/100 dpi/150 dpi/200 dpi/300 dpi/400 dpi/600 dpi
When Document Type is film: 300 dpi/400 dpi/600 dpi/1200 dpi/2400 dpi/4800 dpi
Resolution
Descreen
Select this checkbox to reduce moire patterns.
Printed photos and pictures are displayed as a collection of fine dots. Moire is a phenomenon where
dots may interfere with each other and cause uneven gradation and a stripe pattern in the image.
Descreen is the function for reducing this moire effect.
Note
Scanning takes longer than usual when you enable Descreen.
Unsharp Mask
Select this checkbox to emphasize the outline of the subjects and sharpen the image.
Prevent show-through of the document
Select this checkbox to sharpen text in a document or reduce show-through in newspapers.
Important
Select this checkbox when Document Type is text document and show-through is apparent in the
scanned image.
Remove gutter shadow
Select this checkbox to correct shadows that appear between pages when scanning open booklets.
Important
Align the document correctly with the marks on the Platen.
Gutter shadows can be corrected only when Document Size is set to a standard size.
You cannot select this checkbox when Document Size is Auto Detect, Auto Detect (Multiple
Documents) or Stitch Assist.
Note
Use ScanGear's Advanced Mode tab to correct gutter shadows when scanning non-standard size
documents or when custom cropping frames are set.
For details, see Gutter Shadow Correction in "
Correct slanted document
Select this checkbox to detect the scanned text and correct the angle (within -0.1 to -10 degrees or +0.1
to +10 degrees) of the document.
Important
You cannot select this checkbox when Document Size is Stitch Assist.
The inclination of the following types of documents may not be corrected, as the text cannot be
detected correctly.
- Documents in which the text lines are inclined more than 10 degrees or the angles vary by line
- Documents containing both vertical and horizontal text
- Documents with extremely large or small fonts
- Documents with small amount of text
" for details on how to place documents.
Image Settings " (ScanGear's Advanced Mode tab).
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