Transparency , also known as viewfoil , foil , or viewgraph , is a thin, transparent thin sheet of material, usually cellulose acetate , to a number that can be drawn. These are then placed on top of the projector to be shown to the audience. Many small companies and organizations use projector systems and transparency in meeting and grouping others, although the system is largely superseded by video projectors and interactive whiteboards.
Video Transparency (projection)
Transparencies can be printed on a laser printer or copier. Special transparency is available for use with laser printers that are better able to handle the high temperatures that exist in the fuser unit. For inkjet printers, layered transparencies are available that can absorb and retain liquid ink - although care should be taken to avoid over-exposure to humidity, which may cause transparency to become cloudy; they should also be loaded correctly to the printer as it is usually only coated on one side.
Maps Transparency (projection)
Usage
Use for transparency is as diverse as organizations that use it.
Certain classes, such as those related to math or history, use transparency to describe a point or problem. The mathematics class in particular uses acetate rolls to illustrate a long enough problem and to make computer illustrations unable, due to the lack of mathematical symbols on a standard computer keyboard. This problem is usually limited to high school and college level maths, due to the inclusion of algebra and calculus courses, respectively. In recent years, more and more colleges are turning to digital projectors and PowerPoint presentations.
Aerospace companies, such as Boeing and Beechcraft, use years of transparency in management meetings for short engineers and relevant personnel about the design of new aircraft and existing design changes, bringing the problems outlined.
Some churches and other religious organizations use them to show the outline of sermons and describe certain topics such as Old Testament battles and Jewish artifacts during worship, as well as outline of business meetings.
Space light modulator (SLM)
Many overhead projectors are used with flat panel LCDs that, when used in this way, are referred to as spatial or SLM light modulators. Data projectors are often based on some form of SLM in the projection path. LCD is SLM transmissive, while other technologies such as Texas Instrument DLP are SLM reflective. Not all projectors use SLM (for example, some use devices that produce their own light instead of functioning as transparencies). An example of a non-SLM system is an organic light-emitting diode (OLED).
See also
- Slideshow slide
- Projection panel
- Movie reversal
References
Source of the article : Wikipedia
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