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A slide is a Photography that is created in a transparent matter . It is a positive impression , which presents real colors, developed by a photochemical procedure.

Traditional slides were obtained from the cutting of frames of a film. These cuts then they framed in cardboard or plastic for easy storage and projection. In addition to standing out for their sharpness, these prints made on transparent media were valued for their resistance to the passage of weather : A slide does not usually lose its colors, unlike what happens with color printed photos.

A film is an old Format of fixed image, that teachers used to use in primary and secondary schools until the videocassette was imposed in the eighties, since it was less expensive and offered more benefits. Something similar happened when the market arrived on DVD and then the Blu-ray.

Between the forties and the eighties, with the film it was easy and inexpensive to emit economically educational movies recorded in 16 millimeters , since it did not require much storage space and offered a high speed of rewinding , a mandatory action to reuse them. As if these features were not attractive enough, they were very resistant to shocks and therefore no constant maintenance work was necessary. In fact, even today there are those who continue to use them.

The first slide show machines consisted of a mechanism which allowed to extract the transparency of a lateral sector so that the next slide could be introduced. Then came the projectors that use discs capable of playing numerous slides automatically.

Regarding its history, we must go back to the beginning of the 20th century, when the technique called Autochrome, which allowed to obtain color slides through the reproduction of a synthesis additive Two of its disadvantages with respect to the current characteristics of the slide were its poor definition and its limited color resolution.

Later the technique known as Kodachrome, which did offer vibrant colors thanks to the use of subtractive synthesis and the application of three emulsions , so that almost the entire color spectrum was covered. In 1935, it was the technique that was used for 8 and 16 mm tapes and for 35 mm slides.

At the beginning of the forties, it had reached a lot of popularity, but certain color defects and poor durability made the birth of new techniques , and thus arose Ektachrome and Fujichrome, which allowed for many years to document trips and events that would be immortalized.

Color printed photography managed to move the slide in certain areas, especially in the domestic sphere, although in many professional fields it remained the preferred format, as mentioned above. The advantages of storage Digital, on the other hand, makes any physical medium seem inconvenient.

Currently, the idea of ​​a slide is usually used to name each of the images that are part of a presentation created with a software . Programs like Microsoft PowerPoint They allow you to develop presentations with multiple slides, which can include photographs, graphics, texts, animations and other content.

A writer who offers a conference with tips for creating a novel, for example, can support his dissertation by displaying a presentation armed with a computer program. The author, with the help of a computer (computer) and a giant screen, you can show the different slides with your suggestions.

"Slideshow" finally it is the Title of an album that the Argentine singer and guitarist JAF presented in 1990 . Thanks to its sales, this album became Golden disc .

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