C+Castro

[|Camila Castro]

media type="custom" key="12327766"

media type="custom" key="12125500"

__Scanner __ : noun.

 Any device for exposing an image on film,a sensitized plate,etc., by tracing light along a series of many closely spaced [|parallel lines].

Many different types of scanners exist. Some are used for scanning pictures and making a digital copy to be used on the [|computer] , and some scan [|bar codes]  at grocery stores and other work places. Many people interact with scanner without knowing what they are. Some scanners let the workers at the cash register know what the price of the item you are purchasing is as they read what is embedded in the bar codes. Some scanners can be hand held others have to be put to use on a desk or table.

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For home use. Comes in many colors and sizes in order to personalize the workspace or home. Price range: 29.99$ - 798.00$ depending on features, picture quality, [|pixels], and brand.

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__**A Brief History of Scanners**__ Scanners are considered to have evolved from the early telephotography input devices, which consisted of a rotating drum with a single photo detector at a standard speed of 60 or 120 rpm (later models up to 240 rpm). They sent a linear analog AM signal through standard telephone voice lines to receptors, which synchronously printed the proportional intensity on special paper.

This system was in use in press from the 1920s to the mid-1990s. Color photos were sent as three separated RGB filtered images consecutively, but this was used only for special events due to transmission costs.

The first image scanner ever developed was built in 1957, at the US National Bureau of Standards, by a team led by Russel Kirsch, and it was a drum scanner. The first image ever scanned on this machine was a 5 cm square photograph of Kirsch's then-three-month-old son, Walden. The black and white image had a resolution of 176 pixels.

From then on, scanners have slowly developed into the modern devices that we use today, going through a variety of models and several scanning technologies that have resulted into multiple types of image scanners.

(source:[|gadgets.softpedia.com])