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color gel
A color gel or color filter (British spelling: colour gel or colour filter), also known as lighting gel or simply gel, is a transparent colored material that is used in theatre, event production, photography, videography and cinematography to color light and for color correction.〔http://www.destudiodublin.com/About/Glossary-deStudio.htm#G〕 Modern gels are thin sheets of polycarbonate or polyester, placed in front of a lighting fixture in the path of the beam.
Gels have a limited life, especially in saturated colors. The color will fade or even melt, depending upon the energy absorption of the color, and the sheet will have to be replaced. In permanent installations and some theatrical uses, colored glass filters or dichroic filters are being used. The main drawbacks are additional expense and a more limited selection.
== History ==
In Shakesperean theatre, red wine was used in a glass container as a light filter. In later days, coloured water or silk was used to filter light in the theatre. Later, a gelatin base became the material of choice. Gelatin gel was available at least until 1955. The name ''gel'' has continued to be used to the present day. By 1945 more heat-tolerant self-extinguishing acetate-based through-dyed materials were being manufactured (marketed as Chromoid then Cinemoid by Strand Electric). In the States Roscolene was also developed to deal with these higher output light sources. The acetate filters fell out of favor, since they could not withstand the higher temperatures produced by the 'tungsten halogen lamps' that came into widespread use in the late 1960s. The acetate-based material was replaced by polyester and polycarbonate based filters. These materials have superior heat tolerance when compared to acetate-based gels. They are usually transparent with a surface dye coating. Polyester "gels" were introduced in 1969 as Gelatran, the original deep dyed polyester. The Gelatran process is still used today to create GAM Color in America. Other color manufacturers, such as Lee Filters and Apollo Design Technology use polyester as their color substrate. Lee, Chris James and Apollo use the surface-dyed process for both polyester and polycarbonate base filters. Roscolux is 70% polycarbonate and 30% deep dyed polyester. Almost every color manufacturer today uses either polycarbonate or polyester to manufacture their "gels". Even today's gels can burn out (to lighten in color starting in the center) easily, rendering them useless. To help combat this, a high temperature (HT) material (polyester having the highest melting point 480 °F (250 °C)), can be used to help prolong the life in high-heat output lighting instruments. As instrument design improves, it has become a selling point on many lights to have as little heat radiating from the front of the fixture as possible to help prevent burn-through, and help keep the stage and actors cooler during performances.
In the 1930s Strand Electric of Floral Street, London provided the first numbering system for their swatches and with their agents in New York and Sydney the numbering system went round the world. Remnants of this original filter colour system exist in the colour swatches of today (Deep Amber = No 3; Primary Red = No6; Middle Rose = No10; Peacock Blue = No15; Primary Blue = No20; Primary Green = No39 ). In the theatre, gels are typically available in single 20 x 24inch (500 x 600mm) sheets, which are then cut down to the appropriate size before use. The size originates from the gelatin days: it is the same as a standard baker's sheet, which was used to cast the sheets. In the film industry, gels are usually cut straight from rolls 24" or 48" (600mm or 1200mm) wide and 50' (16m) long, as the size required may vary from a couple of inches to gel a practical halogen spotlight in a ceiling to many feet to gel a whole window, so a standard sized sheet would be impractical.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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