Page:Popular Science Monthly Volume 89.djvu/116

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Photography in Natural Colors

��By Lloyd Darling








��The Brewster camera, showing the red plate, the green plate, and the perforated partition

��COLOR photography is not new. It lias been the goal of ambitious in- ventors ever since scientists really understood something of the nature of light. Nearly all methods of making colored phot()grai)hs are long and ex- pensive. Though beautiful results were in some cases secured, only an able scientist could manipulate the apparatus, time the exposures, and keep track of the dozens of little things all-essential to securing satisfactory results. Kven the Lumiere process, widely employed as it is, is han(lica|)ped 1)\- the fact that the pictures must be ^•iewed through glass. Most of the previous prcjcesses were of the "three-color" type. That is, they depended on the fact that from three colors of the spectrum, red, yellow-green,

��and blue-\iolet, all other hues could be made by combination. Negati\es of an object were made tlirt)ugh red, yellow, and blue filters, and positives therefrom were colored and jiiined in various ways to make a resultant colored picture. Within recent >cars encouraging ex- periments hav'c been made which involve the use of two colors only, red and green. The most recent system of color photog- raphy dependant on this method is that of Mr. IVrc\- 1). Brewster of New York.

Two Plates Are Used with the Camera

The camera emplin-ed in the Brewster system anil other two-color systems differs from the ordinary photograpiier's mainly in that it has two plates in- stead of the customary one. The one

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