By the mid-2000s, sales of all film had declined steeply; and in particular, the volume of Kodachrome exposed had dropped to a level where one single development lab could meet the entire world's demand. The film was then fixed, making these silver halides soluble and leaving only the final dye image. Kodak began researching color imaging in its laboratories as early as 1910, and experimented with a number of color processes; but none had proved fully satisfactory (although one primitive two-color process did give rise to the first use of the name "Kodachrome"). Mees, however, granted them a one-year extension, and still not having solved all the technical challenges they had to solve, they eventually presented Mees with a two-color movie process in 1934.  Kodachrome transparencies have a dynamic range of around 12 stops, or 3.6–3.8D. With digital photography, you gain many benefits [but] you have to put in post-production. • The best film scanners in 2020 , In 1961 Kodak released Kodachrome II with sharper images and faster ASA speeds at 25 ASA. The complex chemistry needed for its development undoubtedly mean that this is one film that we won't see being re-introduced. McCurry used Kodachrome for his 1984 portrait of Sharbat Gula, Afghan Girl, for the National Geographic magazine.
The final steps were to wash the film to remove residual chemicals which might cause deterioration of the dye image, then to dry, cut, and mount the film in slide frames.  The process underwent four significant alterations since its inception. Of the processes developed in the 1930s which replaced Autochrome, Kodachrome was the most successful.. On April 15, 1935, this new film, borrowing the name from Capstaff's process, was formally announced.  The cessation of processing by Dwayne's Photo is commemorated in the book Kodachrome – End of the Run: Photographs from the Final Batches, edited by photographers Bill Barrett and Susan Hacker Stang with introductory essays by famed Time magazine worldwide pictures editor Arnold Drapkin and Dwayne's Photo vice president Grant Steinle. The secret to Kodachrome's success is that it used a different process to other color film. This is because most color films contain dye couplers on the film itself; during development the couplers react with the developer to form the dyes that form the final negative image.
, Due to its complex processing requirements, Kodachrome film was initially sold at a price which included processing by Kodak.
 It was one of the first successful color materials and was used for both cinematography and still photography.
[With Kodachrome,] you take it out of the box and the pictures are already brilliant..  His Kodachrome was a subtractive process that used only two colors: blue-green and red-orange. The green-sensitive layer was redeveloped with a developer that chemically fogged it and formed magenta dye. The new Kodachrome film reached the market in April 1935, in the form of a 16mm movie film. The prevalence of Kodachrome slides also spawned a secondary market in slide projectors, and the tradition of the home "slide show"—a metaphor that survives in computer software, even as photographic slides on real film have become a rare curiosity. Some three years later they were still experimenting using this controlled diffusion method of separating the colors in the multi-layer emulsion, but by then they had decided that instead of incorporating the color couplers into the emulsion layers themselves, they could be added to the developing chemicals, solving the problem of wandering color couplers. The finished transparencies absorbed between 70% and 80% of light upon projection, requiring very bright projection lamps, especially for large projections. Could Kodachrome also rise from the ashes?
Commonly called just K25 and K64, the ISO 25 version ceased production in 2001. , Before Kodachrome film was marketed in 1935, most color photography had been achieved using additive methods and materials such as Autochrome and Dufaycolor, which were the first practical color processes.
An IT8 calibration with a special Kodachrome calibration target is necessary for accurate color reproduction.
Kodachrome was launched in 1935 - initially just as a 16mm movie film format.  During its heyday, many Kodak and independent laboratories processed Kodachrome, but by 2010, only one Kodak-certified facility remained: Dwayne's Photo in Parsons, Kansas.
A color developer then developed the fogged image, and its exhaustion products reacted with a color coupler to form a dye in the color complementary to the layer's sensitivity.
Kodachrome film has no such couplers; instead the dyes are formed on the film by a complex processing sequence that required four different developers; one black and white developer, and three color developers. It required two glass plate negatives, one made using a panchromatic emulsion and a red filter, the other made using an emulsion insensitive to red light.
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