Most traditional photographs
are produced with a two-step chemical process. In
the two-step process, the film holds a negative image
(colours and lights/darks are inverted), which is
then transferred onto photographic paper as a positive
image. Another widely used film is the positive film
used for producing transparencies, usually mounted
in cardboard or plastic frames called slides. Slides
are widely used by professionals mostly due to their
sharpness and accuracy of colour rendition. Most photographs
published in magazines are still originally taken
on color transparency film. (wikipedia)
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