Wednesday, October 12, 2011

Video technology sensitometry

The term sensitometry is to DIN standard 19 040 (part 12) defines as: "Investigation of the properties of radiation-sensitive photographic materials and the various steps of the photographic process."

Especially in photography and in film and video technology sensitometry is the collective name for methods of measurement, with those properties, such as the sensitivity of photographic materials can be determined. Particular term for the measurement of light sensitivity of photographic papers.

As is known in the sensitometry photographic technique and the pre-press to measure the light sensitivity of a light-sensitive emulsion , eg a film or a plate .

Simply explained: sensitometry is concerned with what made for an effect of light on the photographic paper or film.

A variant of the sensitometry Farbsensitometrie at which the spectral response is measured.

Literature
* Ansel Adams :

o The camera . Christian publishing house, Munich 2000, ISBN 3-88472-070-8 , ( The New Ansel Adams Photo Library ), (English edition The Camera . Bulfinch Press, Boston MA et al 1995, ISBN 0-8212-2184-1 , ( Ansel Adams Photography Series )).

o The negative . Christian publishing house, Munich 1998, ISBN 3-88472-071-6 , ( The New Ansel Adams Photo Library ), (English edition: The Negative Bulfinch Press, Boston MA et al 1995. ISBN 0-8212-2186-8 , ( Ansel Adams Photography Series )).

o The positive. The photographic image as positive . Christian publishing house, Munich 1998, ISBN 3-88472-072-4 , ( The New Ansel Adams Photo Library ).

* Josef Maria Eder : Comprehensive Handbook of Photography . Volume 3, Part 4: The sensitometry, photographic photometry and spectrography. (The Schwärzungsgesetze photographic layers, intense light sources, examination of sensitivity, gradation of the playing area of exposure, the copy of the scope and focus. Sensitometry of X-rays) .

3rd completely reworked and enlarged edition. Knapp, Halle (Saale), 1930th

* Hans Arens: color metrics . Akademie-Verlag, Berlin 1951, ( Scientia Photographica. Monographs of the total area of scientific photography 1, ZDB-ID 537570-8 ).

* Jost J. Marchesi: Ilford negative technique . Verlag Photographie, Gilching 1995, ISBN 3-933131-23-5.

The Densitometry is the quantitative Measurement the color density (Solid density), Ie the amount of ink per unit area. Here are LevelsBut no Shades determined. Densitometry is used in the Photography and Reproductive Technology used treatment, providing for quality assurance.

The word "densitometry" is also used to Bone density measurementThat bone densitometry is used. This is an investigation to determine whether a patient has Osteoporosis (Bone loss) is suffering.

Densitometry is based on the Linearity between the amount of color and optical density. The more color, the less light is reflected or transmitted.

Principle: A measuring instrument is first calibrated on the carrier medium to an untreated point to zero. Then it emits light of a precisely defined Wavelength on the color layer. The light penetrates the paint layer and it is filtered, which eliminated certain wavelengths or in their Intensity (physics) be reduced.

The remaining light is from the (mostly white) substrate either reflected and again passes through the color layer, or in the case of a transparent medium (film, foil, ...), occurs on the back again. Now the quantity of light and light can type in the meter photoelectric be measured. The Reflectivity value R, Or Transmission value T can be determined.

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