[filmscanners] RE: Scanning negs vs. slides

["Austin Franklin" <darkroom@ix.netcom.com>]

Anthony,

> > With slide you discard a lot of image information
> > at the shooting stage, with colour neg you defer
> > those decisions until working on the scan ...
>
> Not true.  Slides compress image information; they do not
> eliminate it.

Well, yes they do eliminate it.  Because of their exposure latitude and
limited dynamic range.  The exposure latitude clips the ends.

> In
> a slide, you get extremely detailed gradations of tone from one zone to
> another in the image,

That's not true.  Take a picture of a step wedge and find out for your self.

> This is easy to see just by looking at the response curves of these films.

Wrong.  The response curve has NOTHING to do with representing the dynamic
range/ability to discern tones.

> Both
> types of film provide an equal amount of image information,

Absolutely not true.  The exposure latitude for positive film is far less
than for negative film, and given that, there is less scene information
recorded on slide film.

Austin

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