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 use them with stage lighting instruments to manipulate the shape of the light cast over a space or object-for example to generate a pattern of leaves on a stage floor. Sources
The word “gobo” has come to sometimes make reference to any device that creates patterns of light and shadow, and other pieces of equipment which go before an easy (for instance a gobo arm or gobo head). In theatrical lighting, however, the word more specifically identifies a device positioned in ‘the gate’ or on the ‘point of focus’ between the light source as well as the lenses (or any other optics). This placement is essential because it creates a crisp, sharp edged pattern or design (of logos, fine detail, architecture, etc.). Gobos placed right after the optics usually do not generate a finely focused image, and therefore are more precisely called “flags” or “cucoloris” (“cookies”).
he exact derivation of gobo is unclear. It really is cited by some lighting professionals as “goes before optics” or, less often, “goes between optics”. A different explanation is “graphical optical black out.” The term is traced returning to the 1930s, and originated in reference to a screen or sheet of sound-absorbent material for shielding a microphone from sounds originating from a certain direction, without application to optics. The treating of the word as an acronym is recent and ignores the first definition in favour of popular invention. There are lots of online examples of acoustic gobos. The phrase more than likely is actually a derivative of “goes between.”
A custom gobo from the Earth, projected employing a halogen projector. Gobos are used with projectors and simpler light sources to create lighting scenes in theatrical applications. Simple gobos, integrated into automated lighting systems, are popular at nightclubs as well as other musical venues to create moving shapes.Gobos could also be used for architectural lighting, as well as in interior decorating, like projecting an organization logo on a wall.
Gobos are made of various materials. Common types include steel, glass, and plastic. Steel gobos or metal gobos make use of a metal template from where the photo is reduce. They are the most sturdy, but often require modifications towards the original design-called bridging-to present correctly. To correctly represent the letter “O” as an example, requires small tabs or bridges to aid the opaque center from the letter. These could be visible within the projected image, which might be undesirable in a few applications.
Glass gobos are made from clear glass using a partial mirror coating to bar the sunshine and provide “black” areas inside the projected image. This eliminates any necessity for bridging and accommodates more intricate images. Glass gobos can also include colored areas (much like stained glass windows), whether by multiple layers of dichroic glass (one for each color) glued on an aluminium or chrome coated white and black gobo, or by newer technologies that vary the thickness in the dichroic coating (and thus the color) in a controlled way on a single piece of glass-which assists you to turn one photo in to a glass gobo. Glass gobos generally provide the highest image fidelity, but they are by far the most fragile. Glass gobos are generally created with laser ablation or photo etching.
Plastic gobos or Transparency gobos can be used in LED ellipsoidal spotlights. These “LED Only” plastic gobos could be full color (such as a glass gobo), however are much less delicate. These are unfamiliar with the marketplace, much like Leds, and their durability and effectiveness vary between brands.
Previously, plastic gobos were generally customized for when a pattern requires color and glass will not suffice. However, in a “traditional” (tungston-halogen) light fixture, the main objective point position of the gobo is very hot, so these thin plastic films require special cooling elements to avoid melting. A lapse within the cooling apparatus, even for seconds, can ruin a plastic a gobo in a tungsten-halogen lighting instrument.
Patterns – Theatrical and photographic supply companies manufacture many basic and complex stock patterns. Additionally they can produce custom gobos from customer artwork. Generally, a lighting designer chooses a pattern coming from a manufacturer’s catalog. Due to the great number of gobos available, they can be known as by number, not name. Lighting technicians can also hand cut custom gobos out of sheet metal stock, or even aluminum pie tins.
Gobos are often found in weddings and corporate events. They can 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 particular events-for instance for projecting stars or leaves on the ceiling.
The term “gobo” also is used to describe black panels of numerous sizes or shapes placed from a light source and photographic subject (such as between sun light along with a portrait model) to manage the modeling effect from the existing light. It will be the opposite of a photographer using a “reflector” to redirect light in to a shadow, which can be “additive” lighting and a lot commonly used. Usage of a gobo subtracts light coming from a part of a general shaded subject and creates a contrast between one side of the face and the other. It allows the photographer to show with wider open apertures giving soft natural transitions involving the sharp subject and unsharp background, called bokeh.