Canon CanoScan FB 1200S User Guide - Page 100

Contrast, Gamma Value, Halftones Mid-tones, Histogram, Image File

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Contrast The difference between the highlights and shadows in a scanned film. Raising the contrast has the effect of clarifying the image, while lowering it produces a somewhat blurry appearance. dpi The acronym for dots per inch. The resolution of monitors and printers is expressed as the number of dots displayed or printed in one horizontal inch. See also 'Dot' 'Pixel,' Optical Resolution' and 'Resolution.' Dot The basic element on which images are built. The density of dots in an image is referred to as the image's resolution, which is measured in dots per inch. See 'dpi.' Gamma Value A setting to match the brightness of inputs (the original film) to outputs (the image shown on a monitor or printed out). Halftones (Mid-tones) Shades of gray between the brightest (highlights) and darkest (shadows) portions of an image. Halftones in color and grayscale images can be adjusted with the gamma value adjustment mode. Histogram A graphical representation of the distribution of data bearing varying brightness values in an image. Brightness is expressed as a value ranging from 0 to 255. The histogram shows exactly how much of the sampled area is distributed between bright areas (highlights) and dark areas (shadows). Image File An image that has been expressed as a collection of dots that are assigned varying color and brightness values and 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. 100 FilmGet FAU User's Guide

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FilmGet FAU User’s Guide
Contrast
The difference between the highlights and shadows in a scanned film.
Raising the contrast has the effect of clarifying the image, while
lowering it produces a somewhat blurry appearance.
dpi
The acronym for dots per inch. The resolution of monitors and
printers is expressed as the number of dots displayed or printed in
one horizontal inch. See also ‘Dot’ ‘Pixel,’ Optical Resolution’ and
‘Resolution.’
Dot
The basic element on which images are built. The density of dots in
an image is referred to as the image’s resolution, which is measured
in dots per inch. See ‘dpi.’
Gamma Value
A setting to match the brightness of inputs (the original film) to
outputs (the image shown on a monitor or printed out).
Halftones (Mid-tones)
Shades of gray between the brightest (highlights) and darkest
(shadows) portions of an image. Halftones in color and grayscale
images can be adjusted with the gamma value adjustment mode.
Histogram
A graphical representation of the distribution of data bearing varying
brightness values in an image. Brightness is expressed as a value
ranging from 0 to 255. The histogram shows exactly how much of
the sampled area is distributed between bright areas (highlights) and
dark areas (shadows).
Image File
An image that has been expressed as a collection of dots that are
assigned varying color and brightness values and 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.