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Designating, or pert. to, a photomechanical process employing printings in three colors, as red, yellow, and blue.

Of, relating to, or produced by, the chemical action of rays of light; photographic.

ifying impressed form; stamp; print; type; typical form; representative; as in stereotype phototype, ferrotype, monotype.

such pictures are often without a definite bounding line, any picture, as an engraving, a photograph, or the like, which vanishes gradually at the edge.

A device used by photographers in printing vignettes, consisting of a screen of paper or glass with a central aperture the edges of which become opaque by intensible gradations.

at which the visual rays unite; the position of the eye. -- Visual purple (Physiol.), a photochemical substance, of a purplish red color, contained in the retina of human eyes and in the eyes of most animals. It is quickly bleached by light, passing through the colors, red, orange, and yellow, and then disappearing.…

e banks of rivers and is a good swimmer. It has a white ring around the rump. Called also photomok, water antelope, and waterbok.

e an angle of 50º or less. Wide-angle lenses may cover as much as 100º and are useful for photographing at short range, but the pictures appear distorted.

A process in photographic printing, in which a relief pattern in gelatin, which has been hardened after certain operations, is pressed upon a plate of lead or other soft metal. An intaglio impression in thus produced, from which pictures may be directly printed, but by a slower process than in common printing.…