[permalink] [id link]
Autochrome plates incorporated a mosaic color filter layer made of dyed grains of potato starch, which allowed the three color components to be recorded as adjacent microscopic image fragments.
from
Wikipedia
Some Related Sentences
Autochrome and plates
Autochrome plates were one of several varieties of additive color screen plates and films marketed between the 1890s and the 1950s.
The additive RGB model and variants such as orange – green – violet were also used in the Autochrome Lumière color plates and other screen-plate technologies such as the Joly color screen and the Paget process in the early twentieth century.
A box of Autochrome plates, expiration date 1923.
Unlike ordinary black-and-white plates, the Autochrome was loaded into the camera with the bare glass side facing the lens, so that the light passed through the mosaic filter layer before reaching the emulsion.
Because of the light loss due to all the filtering, Autochrome plates required much longer exposures than black-and-white plates and films, which meant that a tripod or other stand had to be used and that it was not practical to photograph moving subjects.
Larger, non-stereoscopic plates were most commonly displayed in a diascope, which was a folding case with the Autochrome image and a ground glass diffuser fitted into an opening on one side, and a mirror framed into the other side.
Many thousands of original Autochrome plates are still preserved in the Society's archives.
In the U. S. Library of Congress's huge collection of American Pictorialist photographer Arnold Genthe's work, 384 of his Autochrome plates were among the holdings as of 1955.
* The 2006 film The Illusionist tried to recreate the look of Autochrome, although apparently basing that " look " on published reproductions rather than on actual Autochrome plates.
In physical arrangement, however, the Bayer filter mosaic much more closely resembles the regular geometric pattern used in other color screen plates of the Autochrome era, such as the Paget and Finlay plates.
Autochrome plates were discontinued in the 1930s after the introduction of Lumière Filmcolor in sheet film and Lumicolor in roll film sizes.
The shortcomings of the Autochrome process were the expense ( one plate cost about as much as a dozen black-and-white plates of the same size ), the relatively long exposure times which made hand-held " snapshots " and photographs of moving subjects impractical, and the density of the finished image due to the presence of the light-absorbing color screen.
Millions of Autochrome plates were manufactured and used during the quarter century before the plates were replaced by film-based versions in the 1930s.
Autochrome and mosaic
Autochrome is an additive color " mosaic screen plate " process.
To create the Autochrome color filter mosaic, a thin glass plate was first coated with a transparent adhesive layer.
Because the presence of the mosaic color screen made the finished Autochrome image very dark overall, bright light and special viewing arrangements were needed for satisfactory results.
Autochrome and color
Autochrome, the first commercially successful color process, was introduced by the Lumière brothers in 1907.
After an Autochrome plate was reversal processed to produce a positive transparency, the starch grains served to illuminate each fragment with the correct color and the tiny colored points blended together in the eye, synthesizing the color of the subject by the additive method.
* The Autochrome Lumière is the first commercial color photography process.
* 1907 – The Autochrome Lumière is the first color photography process marketed.
The Autochrome Lumière is an early color photography process.
If an Autochrome was well made and has been well preserved, color values can be very good.
Before Kodachrome film was marketed, color photography had been achieved using additive methods and materials such as Autochrome and Dufaycolor, which were the first practical color processes.
The earliest practical and commercially successful color photography reversal process was the Lumière Autochrome, introduced in 1907.
* The Autochrome Lumière is the first color photography process marketed.
Steichen began experimenting with color photography in 1904, and was one of the first people in the United States to use the Autochrome Lumière process.
A 1917 Autochrome color photograph of a French Army lookout at his observation post during World War I.
The first commercially successful color process, the Lumière Autochrome, invented by the French Lumière brothers, reached the market in 1907.
Many additive color screen products were available between the 1890s and the 1950s, but none, with the possible exception of Dufaycolor, introduced as film for still photography in 1935, was as popular or successful as the Lumière Autochrome.
Autochrome and filter
* Modern image sensors in digital cameras most commonly use a Bayer filter, which works in essentially the same way as the colored starch grains in an Autochrome plate -- by breaking up the image into microscopically small color-filtered elements.
Autochrome and grains
The colored starch grains in an Autochrome plate, greatly enlarged.
Autochrome and which
Color photography became much more popular with the introduction of Autochrome Lumière in 1903, which was replaced by Kodachrome, Ilfochrome and similar processes.
It was discontinued around 1907 when the Autochrome process, which was simple to use and required no special equipment, appeared on the market.
Autochrome and be
The user would place the diascope near a window or other light source so that light passed through the diffuser and the Autochrome, and the resulting back-lit, dark-surrounded image would be viewed in the mirror.
Autochrome and image
In short, it is very difficult to form an accurate impression of the appearance of any Autochrome image without seeing the original " in person " and correctly illuminated.
Autochrome and .
An Autochrome of the Taj Mahal reproduced in The National Geographic Magazine, March 1921.
An Autochrome of a World War I Nieuport biplane fighter, circa 1917.
Mirror view in a diascope of a 1913 Autochrome of Percy MacKaye, photographed by Arnold Genthe.
The final version, Alticolor, was introduced in 1952 and discontinued in 1955, marking the end of the nearly fifty-year-long public life of the Autochrome.
Between 1909 and 1931, a collection of 72, 000 Autochrome photographs, documenting life at the time in 50 countries around the world, was created by French banker Albert Kahn.
plates and incorporated
Metal plates are often incorporated into the design where the timber alone would not be strong enough for a given load.
Millikan ’ s and Fletcher's apparatus incorporated a parallel pair of horizontal metal plates.
In this he incorporated the plates used in his previous memoir and supplemented it by a folio atlas ( 1822 ), in which he illustrated his collection of petrified and fossil remains of the animal and vegetable kingdom of a former world.
1.338 seconds.