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Autochrome was an early technique for color photography. Wikipedia has a pretty good explanation [1]. The starch grains were randomly scattered on one side of
by CrazyStat 6y ago
Autochrome was an early technique for color photography. Wikipedia has a pretty good explanation [1].
The starch grains were randomly scattered on one side of the photographic plate, and acted as filters so that small portions of the plate would capture certain colors. The plate was then developed as a positive image.
When you would shine light through the developed plate it would go through the starch grains (still on the plate) as well as the developed image. The developed image controls the luminosity while the colored starch grains again act as a filter and control the hue of the transmitted light, roughly reproducing the original scene.
[1] https://en.wikipedia.org/wiki/Autochrome_Lumi%C3%A8re https://en.wikipedia.org/wiki/Autochrome_Lumi%C3%A8re
- amarshall 6y ago> go through the starch grains (still on the plate) This part is key to understanding. The plate with the starch-based colored mosaic is not simply a filter used upon capture to be removed after (as most filters are today), but also a filter to be used upon viewing. Since the same exact “filter” is used for both capturing and viewing of a given photograph, it allows the mosaic to be random, simplifying creation of the filter.
- jacobush 6y agoso... I wonder if the Bayer matrix on digital sensors was inspired by this. If each sensor was also a display, and the beyer matrix was random, it would be the same thing...