A photomechanical print made directly from a hardened film of gelatin or other colloid; also, the process of making such prints. According to one method, the film is sensitized with potassium dichromate and exposed to light under a reversed negative. After the dichromate has been washed out, the film is soaked in glycerin and water. As this treatment causes swelling in those parts of the film which have been acted on by light, a plate results from which impressions can be taken with prepared ink. The albertype, phototype, and heliotype are collotypes.
Reproductive printing technique that is based on a photo gelatin process and can yield a wide tonal range.
A photographic illustration process
high-quality reproduction process using a gelatin-coated glass plate. also called heliotype and photogelatin printing. linoleum print: a relief print in which the image is carved into linoleum. also called a lino cut. serigraphy: technique that uses a squeegee to force ink through selected parts of stretched mesh containing the image. the image on the mesh can be produced either photographically, by cutting stencil, or by drawing direct with a block out material. the process is also called silkscreen.
photomechanical process. The preparation of a plate by coating a metal surface with light-sensitive gelatin. A photographic negative is placed on the surface and the two are exposed to light. The gelatin dries and hardens in proportion to the strength of the light transmitted through the negative. Collotypes are primarily lithographs and are especially good for reproducing watercolors, lithographs, drawings, and photographs.
A photomechanical process of reproduction capable of producing results of exceptional fidelity. It does not use a screen (like a half-tone) but produces continuous tones.
A photomechanical method for reproducing photographic images.
A photomechanical print process involving the application of light to a gelatin coated plate. Used for high quality reproductions, especially of watercolors, because of the reticulated grain faculty achieved through the process.
a photomechanical printing process that uses a glass plate with a gelatin surface that carries the image to be reproduced; can be used with one or more colors
a mechnanical printing process developed in the late nineteenth century that uses a photo gelatine process for reproduction
A photomechanically printed image made from a photographic image. This process produced an extremely fine and delicate grain, and was favored by publishers who wanted a means of reproduction that emulated the appearance of an actual photograph.
a photo-mechanical process. A sensitised plate or sheet of gelatine, etched by actinic light, produced an impression which absorbs printer's ink in proportion to the action and level of light. Used between 1870 and 1914.
A photomechanical process producing an extremely fine and delicate grain; most popular with Eadweard Muybridge's Animal Locomotion prints.
A planographic process in which the printing surface is a glass plate prepared with reticulated gelatine sensitized with potassium dichromate.
Also called photo gelatin print or heliotype, a reproduction process using gelatin-coated glass or metal plate that produces a continuous tone print.
Method of printing continuous tones using a plate coated with gelatin.
A continuous tone photomechanical process characterized by its ability to reproduce varying tonal ranges.
Continuous-tone printing process using a gelatine coated printing plate.
Collotype is a dichromate-based photographic process developed for large volume mechanical printing before the existence of cheaper offset lithography. It can produce results difficult to distinguish from metal-based photographic prints because of its microscopically fine reticulations which comprise the image. Many old postcards are collotypes.