#retinex

[vainaspaver]

très simple by GOO ROT ☾

[teachersource]

Edwin H. Land was born on May 7, 1909. An American scientist and inventor, best known as the co-founder of the Polaroid Corporation. He invented inexpensive filters for polarizing light, a practical system of in-camera instant photography, and the retinex theory of color vision, among other things. His Polaroid instant camera went on sale in late 1948 and made it possible for a picture to be taken and developed in 60 seconds or less.

[differential]

Edwin H. Land, “Experiments in Color Vision”. Scientific American. Vol. 200, No. 5 (May 1959), pp. 84-99 (16 pages)

Via New Look, Same Great Look by Kim Beil:

“Land’s research undertaken in the mid-1950s first showed that the eye can perceive color in images that are, by other measurements, monochromatic. Land and his team made two monochromatic still lifes of colored scientific equipment: one through a filter that allowed the passage only of long wavelengths (red filter) and the other for short wavelengths (green filter). They then projected the pair of monochromatic transparencies onto a screen and placed a red filter over the projector’s beam. Classical theories would suggest that the resulting image should contain only shades of pink and red. However, viewers discerned varied colors in the scene, which included multicolored pigments in vials and scientific instruments on a table. The colored objects were perceived as if in full color. Color film and other measurement systems, such as spectrometers, recognized only the shades of red in the image, but the visual cortex responded to the differences in wavelength and reconstructed color in the scene by comparison. (Ironically, when this research was published in Scientific American in 1959, Land had to provide artificially colored photographs that reconstructed what the human observers saw, since photographs couldn’t capture the images as perceived.)”

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[kevinbykevinev]

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Support me on ko-fi if you like it :)