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Before personal computers, they were 35 mm slides viewed with a slide projector [1] or transparencies viewed with an overhead projector. In the digital age, a slide most commonly refers to a single page developed using a presentation program such as MS PowerPoint, Apple Keynote, Google Slides, Apache OpenOffice or LibreOffice.
A slide show in Germany. A slide show, or slideshow, is a presentation of a series of still images on a projection screen or electronic display device, typically in a prearranged sequence. The changes may be automatic and at regular intervals or they may be manually controlled by a presenter or the viewer.
A 1960 slide projector. A slide projector is an optical device for projecting enlarged images of photographic slides onto a screen.Many projectors have mechanical arrangements to show a series of slides loaded into a special tray sequentially.
The first document camera, also known as a visualizer, was developed by WolfVision and Elmo and launched at the Photokina Trade Fair in 1988. [2] [3] The widespread use of computers, projectors, and popular presentation programs such as Microsoft PowerPoint in meeting rooms led to overhead projectors being used less frequently.
Multi-image is the now largely obsolete practice and business of using 35mm slides (diapositives) projected by single or multiple slide projectors onto one or more screens in synchronization with an audio voice-over or music track.
In 2017, an online poll of social media users in the UK was reported to show that PowerPoint "remains as popular with young tech-savvy users as it is with the Baby Boomers," with about four out of five saying that "PowerPoint was a great tool for making presentations," in part because "PowerPoint, with its capacity to be highly visual, bridges ...
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens , but some newer types of projectors can project the image directly, by using lasers .
In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.