Trichromy

Trichromatic ( borrowed from ancient Greek τρι tri = three and χρῶμα chroma = color ) is a method of color photography, are made red, green and blue by the color filters in the three separate black and white photographs, which are superposed again for viewing for color representation.

The merging of the three exposures for color image takes on classic black and white film by the positive development of the recordings and subsequent overlapping projection through appropriate color filters. Similarly, the color separations can be assembled electronically into an EBV software.

The difference between the trichromatic to today's conventional color photographs in which the filtered monochrome images are always created at the same time, here is the time-shifted absorption of the color separations.

The method is known since the end of the 19th century and was possible was available as a black and white recording material with panchromatic sensitization.

• Photo technology