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GLOSSARY
BRIGHTNESS
The lightness or darkness of the image.
CHANNEL
The component of an image. Your scanned image has three channels:
red, green, and blue (RGB).
CONTRAST
The gradation of shades in an image. A high contrast image has very
dark areas and bright areas without many middle shades. A low contrast
image has many tones that are close to the same brightness. Low
contrast images are often described as looking ‘flat’.
CROP
To trim and delete the unwanted edges of the image.
DPI
Dots (pixels) per inch.
EMULSION SIDE
The side of the film coated with the photographic material.
GAMMA
The contrast of only the middle tones.
HIGHLIGHTS
The lighter areas of the image.
HISTOGRAM
A graph showing the amount of each level of the 256 brightness levels.
IEEE 1394
Refer to the page 106.
INTERPOLATION
A methord of adding new pixels to an image when resampling up.
JPEG
The JPEG (Joint Photographic Experts Group) compression standard is
capable of producing a high compression ratio while maintaining image
quality. JPEG is a widely supported image file format.
MIDTONE
The middle shades of an image, in between light and dark.
NEUTRAL
Having no colour cast, such as black, white, or grey.
PICT
(Macintosh operating system only) The PICT graphic file format uses a
lossless compression scheme and is compatible with many Macintosh
applications.
PIXEL
Abbreviation for picture element. The dots that make up an electronic
image.
RESAMPLE
To change the number of pixels in the image. If pixels are discarded
when shrinking an image, it is called resampling down. If new pixels are
created in an image, it is called resampling up (see page 89).
RESOLUTION
The number of pixels in a given area of the image; such as pixels per
inch or pixels per centimetre. High resolution is the term for an image
with a lot of pixels in a given area. Low resolution means there are not
many pixels in a given area.
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