Canon FB630U - Manual (Page 28)

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S T E P 2
When an image is scanned, it is read as a collection of “dots.” The scan mode that is
selected determines how each of these dots is represented in the output. The following
five scan modes are available.
Black and White Mode (Line)
Displays each dot as either black or white. Grays and halftones are also reproduced
as black or white. The Black and White mode is best for documents that contain
text and line drawings and not suited for images with color gradations.
Black and White Mode (Diffusion Dither)
Displays each dot as either black or white. In order to create gray tones this method
uses randomly dispersed black dots on white to create a more natural looking
gradation.
Grayscale Mode (8-bit)
In the Grayscale mode, each dot is formed by assigning it eight individual “bits” of
data. By combining these bits in various different ways, a dot can be expressed in over
256 distinct shades. Photographic images are reproduced relatively naturally in this
mode, but the file size is much larger than that produced by the Black & White mode.
Set Scan Mode