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Glossary
Brightness. The balance of light and dark shades in an image.
Composite video. A type of video signal that encodes picture,
luminance, and synchronization information so it can be carried in one
signal.
Contrast. A measure of the tonal differences between the highlights
and shadows of an image. In a high-contrast image, light areas are very
bright and dark areas are very dark, with relatively few levels of gray
between white and black. Contrast is decreased by adding grays.
NTSC. A 525-line video broadcast format developed by the National
Television Standards Committee. NTSC is widely used in North
America, Mexico, and Japan.
PAL (Phase Alternation by Line). A 625-line video broadcast format
used in Western Europe, India, China, Australia, New Zealand, and
parts of Africa.
pro-gls.fm Page 99 Friday, November 7, 1997 5:25 PM