A Gobo is a stencil or template placed inside or in front of a light source to regulate the shape of the emitted light. Lighting designers typically make use of them with stage lighting instruments to manipulate the shape of the light cast over a space or object-for instance to produce a pattern of leaves on the stage floor. Sources
The phrase “gobo” has arrived to sometimes refer to any device which produces patterns of light and shadow, and various pieces of equipment which go before an easy (for instance a gobo arm or gobo head). In theatrical lighting, however, the word more specifically describes a device placed in ‘the gate’ or on the ‘point of focus’ involving the source of light as well as the lenses (or any other optics). This placement is essential as it creates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed following the optics usually do not create a finely focused image, and are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It is actually cited by some lighting professionals as “goes before optics” or, more infrequently, “goes between optics”. An alternate explanation is “graphical optical black out.” The phrase is traced returning to the 1930s, and originated in reference to some screen or sheet of sound-absorbent material for shielding a microphone from sounds originating from a specific direction, with no application to optics. The management of the phrase as being an acronym is recent and ignores the initial definition in favour of popular invention. There are lots of online types of acoustic gobos. The word probably is really a derivative of “goes between.”
A gobo projector of the Earth, projected employing a halogen projector. Gobos are utilized with projectors and simpler light sources to generate lighting scenes in theatrical applications. Simple gobos, integrated into automated lighting systems, are popular at nightclubs and other musical venues to generate moving shapes.Gobos could also be used for architectural lighting, along with interior design, as in projecting an organization logo over a wall.
Gobos are created from various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos use a metal template that the image is eliminate. These are the basic most sturdy, but often require modifications for the original design-called bridging-to show correctly. To correctly represent the letter “O” as an example, requires small tabs or bridges to aid the opaque center in the letter. These may be visible within the projected image, which might be undesirable in a few applications.
Glass gobos are made of clear glass having a partial mirror coating to bar the light and create “black” areas in the projected image. This eliminates any necessity for bridging and accommodates more intricate images. Glass gobos could also include colored areas (much like stained glass windows), whether by multiple layers of dichroic glass (one for each and every color) glued with an aluminium or chrome coated black and white gobo, or by newer technologies that vary the thickness in the dichroic coating (and for that reason colour) in a controlled way on one bit of glass-which assists you to turn one photo in to a glass gobo. Glass gobos generally provide the highest image fidelity, but are probably the most fragile. Glass gobos are usually designed with laser ablation or photo etching.
Plastic gobos or Transparency gobos may be used in LED ellipsoidal spotlights. These “LED Only” plastic gobos can be full color (just like a glass gobo), but are far less delicate. They are new to the current market, as well as LED lights, and their durability and effectiveness vary between brands.
Before, plastic gobos were generally custom made for when a pattern requires color and glass does not suffice. However, in a “traditional” (tungston-halogen) light fixture, the main objective point position of the gobo is extremely hot, so these thin plastic films require special cooling elements to stop melting. A lapse in the cooling apparatus, for seconds, can ruin a plastic a gobo in a tungsten-halogen lighting instrument.
Patterns – Theatrical and photographic supply companies manufacture many easy and complex stock patterns. In addition they can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern coming from a manufacturer’s catalog. Because of the great number of gobos available, they can be referred to by number, not name. Lighting technicians can also hand cut custom gobos away from sheet metal stock, or even aluminum pie tins.
Gobos are frequently used in weddings and corporate events. They could project company logos, the couple’s names, or virtually any artwork. Some companies can turn custom gobo after as little as every week. Designers rxziif use “stock” gobo patterns for these events-for instance for projecting stars or leaves onto the ceiling.
The term “gobo” also is utilized to describe black panels of different sizes or shapes placed between a light source and photographic subject (including between sun light as well as a portrait model) to regulate the modeling effect in the existing light. This is the opposite of a photographer employing a “reflector” to redirect light right into a shadow, that is “additive” lighting and most commonly used. Usage of a gobo subtracts light from the portion of a general shaded subject and creates a contrast between one side of the face and the other. It allows the photographer to expose with wider open apertures giving soft natural transitions involving the sharp subject and unsharp background, called bokeh.