Photochromy

Photochromy is the art or process of reproducing

color Color (American English) or colour (British English) is the visual perceptual property deriving from the spectrum of light interacting with the photoreceptor cells of the eyes. Color categories and physical specifications of color are associ ...

s by

photography Photography is the art, application, and practice of creating durable images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is employed ...

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OTE is the national telecommunications provider of Greece.

OTE may also refer to:
* Ocean thermal energy conversion, a renewable energy source
* Oda of Haldensleben (978–1023), daughter of the Margrave of the North March, Theoderich
* On-tar ...
/sup> Not to be confused with Photochromism (a reversible color change induced by light energyThe Focal Encyclopedia of Photography, page 1079, Desk Edition (1969), Focal Press, ). See Photochromism

Photochromism is the reversible transformation of a chemical species (photoswitch) between two forms by the absorption of electromagnetic radiation (photoisomerization), where the two forms have different absorption spectra. In plain language, th ...
. Furthermore, a Photochrom

Photochrom, Fotochrom, Photochrome or the Aäc process is a process for producing colorized images from a single black-and-white photographic negative via the direct photographic transfer of the negative onto lithographic printing plates. The proc ...
is not the result of the photochromy process.

History

Colored images by direct exposure from nature using a Lippmann plate

Gabriel Lippmann conceived a two-step method to record and reproduce colours, variously known as direct photochromes, interference photochromes, Lippmann photochromes, Photography in natural colours by direct exposure in the camera or the Lippman ...

Color printing method by the bleach-out process.

Notes

In the original publication in 1891, Lippmann reports on photochromy in which he describes his famous method of photography in colors, the so-called "interference" method, based on the action of stationary waves.

References

{{reflist

Photographic processes dating from the 19th century}