Canon CanoScan FS2700F User Manual - Page 129

Image File, Resolution, Threshold, Tone Curve, TWAIN, See Gamma Correction.

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Appendices Image File An image that has been expressed as a collection of dots assigned varying color and brightness values that has been converted into a data format that can be read by a computer. The fundamental structure of an image file is a bitmap, the horizontal and vertical arrangement of the dot information, which is supplemented by other data in popular image formats, such as the TIFF, JPEG and BMP formats. Resolution The density of the dots that comprise an image expressed as a collection of dots. The fineness or coarseness of an image is expressed as the number of dots per inch (dpi). RGB An acronym for the "three base tones of light," red, green and blue, used in varying combinations to reproduce the full spectrum of colors on monitors and other output devices. The scanner detects red, green and blue light reflected from the original film with its sensors. Color printers use the complementary colors to RGB, namely cyan, magenta, yellow and black (CYMK) to express colors. Cyan, yellow and magenta are referred to as the "three base tones of color." Scan The process whereby a scanner is used to read information off an original document or image. In CanoCraft FS, clicking the [Save] or [Scan] button causes the scanner to scan a film using various settings, such as resolution, brightness, color balance and special effects, and to save the resulting image as a file in the specified location. Threshold When an image is expressed using only two colors, black or white, the threshold is the dividing point at which the original data is assigned either a black or white value. Tone Curve See Gamma Correction. TWAIN The standard application programming interface for input devices, such as image scanners. If both the input device and software comply with this standard, the two are compatible regardless of the manufacturer or model type. 129

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129
Appendices
Image File
An image that has been expressed as a collection of dots assigned varying
color and brightness values that has been converted into a data format
that can be read by a computer. The fundamental structure of an image file
is a bitmap, the horizontal and vertical arrangement of the dot
information, which is supplemented by other data in popular image
formats, such as the TIFF, JPEG and BMP formats.
Resolution
The density of the dots that comprise an image expressed as a collection of
dots. The fineness or coarseness of an image is expressed as the number of
dots per inch (dpi).
RGB
An acronym for the “three base tones of light,” red, green and blue, used
in varying combinations to reproduce the full spectrum of colors on
monitors and other output devices. The scanner detects red, green and
blue light reflected from the original film with its sensors. Color printers
use the complementary colors to RGB, namely cyan, magenta, yellow and
black (CYMK) to express colors. Cyan, yellow and magenta are referred to
as the “three base tones of color.”
Scan
The process whereby a scanner is used to read information off an original
document or image. In CanoCraft FS, clicking the [Save] or [Scan] button
causes the scanner to scan a film using various settings, such as resolution,
brightness, color balance and special effects, and to save the resulting
image as a file in the specified location.
Threshold
When an image is expressed using only two colors, black or white, the
threshold is the dividing point at which the original data is assigned either
a black or white value.
Tone Curve
See Gamma Correction.
TWAIN
The standard application programming interface for input devices, such as
image scanners. If both the input device and software comply with this
standard, the two are compatible regardless of the manufacturer or model
type.