Canon CanoScan FS2720U Manuale del prodotto - Pagina 24
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CanoScan FS2720U Film Scanner
Negative/Positive Film
Color Negative Film
Negative film is used to make prints. The light and dark portions of the film are
reversed from the image. It permits a large degree of latitude (the extent to
which it is under- or over-exposed) so that even if a picture is slightly under- or
over-exposed (the amount of light striking the film) when shot, the problem can
be corrected by the developer when printed to paper. The negative film format is
recommended when you wish to shoot without being strictly conscious of the
exposure setting or when you wish to have the picture output as prints. How-
ever, the color of the film base (the color of the film itself) varies somewhat
between manufacturers and between individual products. For this reason, the
CanoScan FS2720U has to utilize a color correction process to reproduce colors
correctly. This process is conducted automatically by the CanoScan FS2720U
auto color balance function.
Color Positive Film
Positive film (reversal film) reproduces the colors on film as they are on the
photographic subject so that the colors of a photographed object are immedi-
ately apparent. This format is used when the pictures are viewed as slides or
when printing plates are being made. Compared to negative film, the latitude of
positive film is narrow, requiring the photographer to pay more attention to the
exposure setting. Since there is no effect on color reproduction because of
differing film base colors, the CanoScan FS2720U does not need to perform its
auto color balance function on films in this format.