Canon MP980 series On-Screen Manual page 625

Input Settings
the image in 256 levels (8 bit) of R(ed), G(reen), and B(lue).
Color(48bit)
Select this mode to scan color photos or film. This mode renders the image in 65536 levels (16
bit) of R(ed), G(reen), and B(lue).
Grayscale
Select this mode to scan black and white photos or film, or to create black and white images. This
mode renders the image in 256 levels (8 bit) of black and white.
Grayscale(16bit)
Select this mode to scan film in black and white. This mode renders the image in 65536 levels
(16 bit) of black and white.
Black and White
Select this mode to scan photos and documents in 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. The threshold level can be set with
(Threshold).
Important
Some applications cannot display images scanned in Color(48bit) or Grayscale(16bit).
Color(48bit) and Grayscale(16bit) are displayed only when the Enable 48/16 bit Output checkbox
is selected on the Scan tab of the Preferences dialog box.
Scan Tab
Input Size
The Paper Size is displayed before preview. After preview, the cropping frame size or film size is
displayed.
You can adjust the cropping frame (scan area) size by entering the values into
(Height).
Click (Keep Aspect Ratio) and change it to
specify the cropping frame size.
Important
Input size settings are available only when Output Size in Output Settings is Flexible. If you select
a size other than Flexible, a cropping frame calculated from Output Size and Output Resolution is
displayed, and its aspect ratio is fixed.
Note
The values you can enter will be within the range of the selected document size. The minimum
size is 96 pixels x 96 pixels when Output Resolution is 600 dpi and Enlarge/Reduce is 100%.
When Auto Crop is performed, the aspect ratio will not be maintained since the size will be
prioritized.
See " Adjusting Cropping Frames
(Locked) to maintain the aspect ratio when you
" for details on cropping frames.
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