Setting The Scan Mode - Canon CanoScan FB 1200S User Manual

Setting the Scan Mode

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
Expresses the image with dots of only two shades: black or white. Select Threshold
to lighten or darken the entire image by setting the value by which dots are judged
to be either black or white. Select this option for scanning photographs and text for
printing in monochrome.
8-bit Grayscale
Expresses a dot in up to 256 shades of gray. Select this option for scanning black
and white graphics and photographs.
12-bit Grayscale
Expresses a dot in up to 4,096 shades of gray. Select this option for exceptionally
high quality grayscale images. However, the file will be approximately twice the size
of an 8-bit Grayscale file.
24-bit Color
Expresses a dot with 8 bits for each primary color – red, green, and blue (RGB) – for
a total of 24 bits. A dot can be expressed in up to 16.8 million distinct shades. Use
this option for most color photographs.
36-bit Color
Expresses a dot with 12-bits for each primary color – red, green, and blue (RGB) –
for a total of 36 bits. A dot can be expressed in up to 68.7 billion distinct shades.
However, the file will be approximately twice the size of a 24-bit Color file.
Hint
Scanning the same image in the three different scan modes produces different
file sizes. By size, black and white mode requires the least disk space, followed
in order by the grayscale and the color modes. Before scanning, check the data
volume indicator on the control panel.
The numerator indicates the amount of disk
space required for the scanned image while
the denominator indicates the amount of
disk space available. When the required
space exceeds the available space, the scan
button is unavailable.
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