Food for Thought - DensitometerA densitometer is a device that measures the degree of darkness (the optical density) of a photographic or semitransparent material or of a reflecting surface. The densitometer is basically a light source aimed at a photoelectric cell. It determines the density of a sample placed between the light source and the photoelectric cell from differences in the readings. Modern densitometers have the same components, but also have electronic integrated circuitry for better reading.
Types of densitometersThere are three types of densitometers:
Density and opacity are the same thing but they are measured differently. Density is measured with readings that run on a scale from 0 to 4.0, with the highest number having the greatest density. Opacity is measured in decimal numbers ranging from 1 to 100. The higher the number, the great the opacity. Food for Thought (Seeds to enrich your roots):
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Density is the level of darkness in a negative or positive film or print. The measurement of density is called densitometry. An instrument called a densitometer is used to measure the density. The density of a photographic positive or negative is a result of the amount of silver dye developed in the film or photographic paper. In printed copy, density is caused by the light-stopping ability of the pigments in the printing ink that are deposited on the paper by the printing process. Densitometers are widely used in the graphics industry to help control color in each step of the printing process.
