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A gobo in a gobo holder, which goes in a stage lighting instrument. The discolored portion is oxidation of the stainless steel caused by the high temperature of the lamp, but the gobo is still usable. A glass gobo of the Earth, projected using a halogen projector A gobo being projected with beams of smoke
Multi-image as a business thrived during the 1970s and 1980s. Multi-image presentations ranged from single projector shows run by projector-viewer [3] to large events for business meetings and conventions where multiple shows would be presented and often were rear-projected by 24 or more projectors.
In Bristol in 1968, progress was also being made, mainly for use in live music. Peter Wynne Wilson refers to the use of 1 kW profiles, with slides onto which gobos were printed, inserted from a reel just like on a slide projector. The fixtures also had an iris and a multiple colored gel wheel.
By placing the pattern inside of the focal plane of a fixture adjustments to image (hard or soft edges) can easily be created. Larger pattern holders are also available designed to mount into the accessory slot on some fixtures, allowing for the use of larger gobos, or the projection of two overlapping patterns from a single fixture.
Other common accessories include gobo holders or rotators, iris holders, donuts, barn doors and color scrollers. Gobos are templates made from a thin piece of metal that have designs to project patterns. An Iris is an accessory which can alter the size of the projected beam of light.
Projection mapping, similar to video mapping and spatial augmented reality, is a projection technique [1] [2] used to turn objects, often irregularly shaped, into display surfaces for video projection. The objects may be complex industrial landscapes, such as buildings, small indoor objects, or theatrical stages.