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When it comes to the old photos you have lying around, you don’t need to pay for an expensive digitizing service or buy a scanner. You can use an app.
In 1905 Keystone View Company began its Educational Department, selling views and glass lantern slides (the 4 x 3.25 inch ancestors of the better-known 2 x 2 inch slides containing transparencies on film, which eventually replaced them) to schools throughout the country. They also produced lantern slide projection equipment.
Reversal film created a small positive projectable image rather than the negatives used since the early days of photography; photography now produced 35mm directly viewable small colour slides, rather than large monochrome negatives. The slide images were too small for unaided viewing, and required enlargement by a projector or enlarging viewer.
A single slide, showing a color transparency in a plastic frame Slide projector, showing the lens and a typical double slide carrier. In photography, reversal film or slide film is a type of photographic film that produces a positive image on a transparent base. [1]
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A slide viewer is usually a small handheld device with a slot in which a slide can be inserted to see a magnified illuminated view of it. A slide viewer is an instrument for individual viewing. Some models have an automatic feeder for inserting multiple slides and some have a slot for a strip of film.
A liquid-crystal panel mounted in a plastic frame was placed on top of the overhead projector and connected to the video output of the computer, often splitting off the normal monitor output. A cooling fan in the frame of the LCD panel would blow cooling air across the LCD to prevent overheating that would fog the image.