American cinematographer (Jan-Dec 1927)

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April, 1927 AMERICAN CINEM ATO GRAPHER Seventeen white outer petals with a yellow central cup. The reproduction on the orthochromatic plate renders the yellow as very dark, only slightly lighter than the black background. The superior rendition of visual brightness is obvious in the reproduction on the panchromatic material, the yellow being rendered almost as bright as the white, thus corresponding to the visual impression. In Fig. 19 are shown two reproductions of a poster. The sky in the original is dark blue, while the moon is represented by a bright orange disc. It will be noted that the orthochromatic material renders the moon as much darker than the sky background, this being the inverse of the visual relationship. On panchromatic film the brightness ratio between sky and moon is reversed and corresponds with the visual ratio. In Fig. 20 is shown a photograph of a painting. The dress is a brilliant scarlet while the background is very dark. The orthochromatic material reproduces this so that the scarlet dress, which is visually many times brighter than the black background, is just perceptibly lighter than the background. In case of the reproduction on panchromatic material the brightness ratio is as it should be, the scarlet dress being rendered as an area of much higher brightness than the black background. Illustrations of the improvement in tone reproduction by use of panchromatic material could be multiplied indefinitely. These three, however, serve as sufficient illustration. Uses of Panchromatic Film THE application of panchromatic motion picture film to practical problems may for convenience be classified in two main divisions: (a) to obtain correct reproduction of the visual brightnesses in a scene containing variously colored objects and (b) to obtain desired distortion of brightness in a scene consisting of variously colored objects. Correct Reproduction The first of these purposes may be referred to as the normal usage of such film. The curves showing the relation between sensitivity and wave-length for this material indicate that it is sensitive to all wave-lengths of visible radiation. There is, however, an appreciable preponder paris brussels % VIENNA ROME MADRID LISBON % JERUSALEM H LONDON RENE GUISSART % Atmospheric Shots in Any Part of Europe Taken according to your own instructions in an artistic manner to match the photography of your production. OFFICIAL CORRESPONDENT IN EUROPE FOR: A merican Society of Cine mat ographers; Frank D. Williams 12 Rue d'Aguessan PARIS Cable Address : LOUVERANDE-PARIS BERLIN m BUDAPEST GENEVA CAIRO °£ ATHENS ALGIERS ETC. ETC. E. Burton Steene Freelance Akeley and Eyemo Camera Care of American Society of Cinematographers 1219-20-21-22 Guaranty Bldg. HOLLYWOOD, CALIF. GRanite 4274 FOR RENT Two Bell & Howell Cameras 40, 50, 75 mm. lenses. Thalhammer Iris. Jeanne Trebaol, 10042 Stilson Ave., corner of Clarington, Palms, Calif. Phone: Culver City 3243.