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Dimâge Scan Dual II 99
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.
INTERPOLATION A form of adding new pixels in 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 color cast, such as black, white, or gray.
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.