NTSC and PAL VHS

Also known as heliogravure, photogravure is arguably the finest photomechanical means of reproducing a photograph in large editions. Copper plates are acid-etched directly from an original silver print; the etched areas then hold differing amounts of ink in order to correspond to the tones of the original print. If prints remain untrimmed, the impression of…

A sheet of transparent film coated with silver salts which react when exposed to light (usually in a camera). In black and white negatives, one layer of salts reacts to white light (the full spectrum of light). The result is a reversal of normal vision: the shadows are light, the highlights dark. In colour negatives…

Different types of photographic paper have varying degrees of susceptibility to fading over time. The main cause of this is exposure to UV (ultra violet) light, although humidity, temperature, pollution and acidity are all contributing factors. Exposure to direct sunlight should be avoided, and UV-resistant glass can be used when framing.

The autochrome is an early color photography process, patented the 17th December 1903 by Auguste and Louis Lumière. Before the commercialization, they diffused the autochrome technique to some favored photographers, like Sergey Prokudin-Gorsky. The commercialization started in 1907 and the technique was used between 1907 and about 1932. A lot of photos of the First World…

A photogram is a photograph made without a lens or camera: objects are placed directly on top of a sheet of photographic paper which is then exposed to light. Where the objects obstruct the light, the paper remains unexposed (light in tone), while the rest darkens through exposure.

Although it may seem too obvious to mention, may people are unaware of what exactly constitutes a print. Put simply, a print is a method of image-making that allows the work of art to be created more than once. The size of the edition (i.e.the number of prints produced of the one work), the significance…