Glossary - Canon ScanGear CS-S 4.3 User Manual

CONTENTS
INDEX
Acquired Images
Images sent from your scanner software to the host graphics application.
ADF
Automatic Document Feeder, an optional attachment that lets your scanner
perform continuous scanning of documents.
Automatic Tone Adjustment
Automatic analysis and adjustment of the image using Contrast/Brightness
and Gamma settings.
Bits and Bit Depth
A bit (BInary digiT) is the smallest possible unit of information on a computer;
it represents yes or no; on or off; 1 or 0. Bit Depth is used to describe the
complexity of a graphic image.
One bit, or bilevel, images are black and white. This is the Black and White
setting in ScanGear CS-S.
Grayscale (8 bit)
Expresses a dot in 256 shades of gray between white and black.
Grayscale (12 bit)
Expresses a dot in 4,096 shades of gray between white and black.
Color (24 bit)
Expresses a dot with 8 bits for each primary color for a total of 24 bits (8 bits x
3 colors=24 bits). A dot can be expressed in up to 16.8 million distinct
shades(256
High Quality Color (36 bit)
Expresses a dot with 12 bits for each primary color, red, green, and blue
(RGB), for a total of 36 bits (12 bits x 3 colors =36 bits). A dot can be ex-
pressed in up to 68.7 billion distinct shades (4,096
Black-Point
The darkest portion of an image scanned as Color or Grayscale. When you
click on the image with the Black-point eyedropper, all tones darker than the
selected sample tone are adjusted to black. See also
White-point Eyedropper.
3 =16.8 million)

Glossary

Glossary
3 =68.7 billion)
Mid-point Eyedropper,
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