negative-positive process

The calotype, introduced in 1841; a negative-positive process using a paper negative.

Besides inventing the negative-positive process of photography, Talbot produced the first published book to be illustrated with photographs.

Papers used for negative-positive processes.

Eastmancolor, introduced in 1950, was Kodak's first economical, single-strip 35 mm negative-positive process incorporated into one strip of film.

In 1841, William Fox Talbot patented the calotype process, the first negative-positive process, making possible multiple copies.

Unlike reversal-film transparency processes, negative-positive processes are, within limits, forgiving of incorrect exposure and poor color lighting, because a considerable degree of correction is possible at the time of printing.

Talbot, the archetypal 19th-century polymath and inventor, came up with the negative-positive process, the chemical and mechanical method that did for visual images no less than what the printing press did for the written word.

The collodion wet plate process introduced in 1851; a negative-positive process using halide-impregnated collodion poured from a bottle onto a glass plate and sensitized by immersion in a silver nitrate bath.

In fact, Talbot's contribution, the negative-positive process, was born of his own inability to make a successful drawing even with the help of a camera lucida, and he titled his book, the first to be illustrated with photographs, "The Pencil of Nature."

After that come works by William Henry Fox Talbot, who was as important as Daguerre, if not more so, for inventing the negative-positive process; James Cutting, the originator of the photo-lithograph; Louis Desire Blanquart Evrard, who devised the albumen print, and other pioneers.