optical densitometers

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Densitometer — Not to be confused with hydrometer which measures mass density of liquids. Heiland Densitometer TRDZ 1 A densitometer is a device that measures the degree of darkness (the optical density) of a photographic or semitransparent material or of a… … Wikipedia
Dot gain — (also known as Tonal Value Increase) is a phenomenon in offset lithography and some other forms of printing which causes printed material to look darker than intended. It is caused by halftone dots growing in area between the original printing… … Wikipedia
Densitometry — Principle of spot light densitometry Densitometry is the quantitative measurement of optical density in light sensitive materials, such as photographic paper or film, due to exposure to light. Optical density is a result of the darkness of a… … Wikipedia

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