Additive 3 color: Line screen plate, still photography
“The most successful of all the screen processes was the one initiated by Louis Dufay. Today the product is known as Dufaycolor, but it was first introduced about 1910 as the Dioptichrome plate. The first Dufay patents were assigned to an ...
Dr. Douglas Arthur Spencer (Color Photographs Limited of London)
Subtractive 3 color: pigment process, still photography
“Vivex prints were introduced by Color Photographs Limited of London in 1928. One of the most important features of this printing method, invented by Douglas Arthur Spencer (1902–1980), was the introduction in 1929 of cellophane, instead of ...
Pénichon, Sylvie (2013): Twentieth Century Colour Photographs. The Complete Guide to Processes, Identification & Preservation. London, Los Angeles: Thames & Hudson, p. 105.
“The Warner-Powrie process patented in 1905 was the earliest commercial process using a screen made with bichromated colloid. A glass plate was thinly coated with bichromated gelatin or fish glue and exposed to light through a screen having ...
additive three-color: Integrated filters and rotary filter
Much like many other additive processes, the Wolff-Heide system was based on three black and white color separations printed consecutively on one film strip and projected through a rotary filter attached to the projector. However, the biggest ...