Canon PIXMA MG4200 Series On-Screen Manual page 644

256 levels (8 bit) of R(ed), G(reen), and B(lue).
Grayscale
Select this mode to scan black and white photos, or to create black and white images. This mode
renders the image in 256 levels (8 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
Input Size
In thumbnail view, the cropped document size is displayed after preview.
In whole image view, the Paper Size is displayed before preview, and the cropping frame (scan area)
size is displayed after preview.
You can adjust the cropping frame size by entering the values into
Click (Change Aspect Ratio) and change it to
when you 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, scaled at 100%.
When Auto Crop is performed in whole image view, the aspect ratio will not be maintained since the
size will be prioritized.
See "Adjusting Cropping
(Keep Aspect Ratio) to maintain the aspect ratio
Frames" for details on cropping frames.
(Threshold).
(Width) and (Height).
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