Canon MP980 series On-Screen Manual page 536

Scan Settings Dialog Box
Button Settings tab is displayed and cannot be changed in this dialog box.
Color Mode
Select how to scan the document.
Color
This mode renders the image in 256 levels (8 bit) of R(ed), G(reen), and B(lue).
Grayscale
This mode renders the image in 256 levels (8 bit) of black and white.
Black and White
This mode renders the image in black and white. The contrast in the image is divided at certain
levels (threshold level) into black and white and is rendered in two colors.
Important
You cannot select Black and White if Document Type is film.
Note
Color Mode is not displayed in the Scan Settings dialog box opened from the Scanner Button
Settings tab.
Document Size
Select the size of the document to be scanned.
When you select Custom, a screen in which you can specify the document size appears. Select a
Units, then enter the Width and Height and click OK.
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.
" for details on how to place documents.
Page 536 of 947 pages