Continuous tone image definitions

Continuous tone image

Image comprising infinite number of grey levels between black and white. Sometimes referred to as greyscale image.
Found on http://www.encyclo.co.uk/local/20462

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Continuous-tone image

An image containing gradient tones from black to white.
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl

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