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

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.

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.…