[filmscanners] RE: film and scanning vs digital photography

["Laurie@advancenet.net" <laurie@advancenet.net>]

> This isn't quite accurate.  Digital Sensors actually use analogue
> sensors.  They then translate the information via an A/D converter, to
> a digital entity which is then either saved as is or further processed as
> a JPEG.

Technically we are in agreement; I oversimplified in order to avoid
confusion.  The image information is transmitted from the lens to the
analogue sensors to an A/D where it is converted into digital data, which is
then further processed and saved as a standard image file format like JPEG
or TIFF.  This represents a first generation capture and is equivalent to
capturing the image information to film, which is also a first generation
capture in my terminology.

When one scans film or prints, one is doing something similar to what one
does when one captures image information with a digital camera; only this
time one is capturing already captured analog image information that was
captured on film or in a print and digitalizing the previously captured
analog information, which makes this capture a second generation capture in
my terminology.

Hope this clarifies things and suggests that we are not in disagreement.

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk] On Behalf Of Arthur Entlich
> Sent: Wednesday, July 04, 2007 6:49 PM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: film and scanning vs digital photography
>
>
>
> Laurie@advancenet.net wrote:
>
> >To put it simply, when you capture an image with a DSLR camera, you
> are in
> >effect directly scanning the image transmitted by your lens into
> digital
> >electronic form; you do not need to go through a second process in
> order to
> >convert the analog capture on film into an electronic digital capture.
> The
> >first generation capture equivalent for film is when you transmit the
> image
> >data from the lens to the film; scanning it into digital form later is
> a
> >second generation capture.
> >
> >
> >
> This isn't quite accurate.  Digital Sensors actually use analogue
> sensors.  They then translate the information via an A/D converter, to
> a
> digital entity which is then either saved as is or further processed as
> a JPEG.
>
> You are correct that this same process occurs with a film scanner, so
> there are extra translations going on (Film image (and all that entails
> to get to that point) to electro-optical sensor image to digital file
> format.
>
> > Of course there can be some of this in play as well; but it probably
> has
>
> >more to do with Getty knowing the demands of their clients and wanting
> to
> >play it safe by insisting on equipment and processes that they are
> familiar
> >with and know will produce that quality rather than taking the risk of
> >having to spend time sorting through submissions which come from
> sources,
> >equipment, and processes that they are not familiar with and cannot be
> sure
> >are up to their needs.  Sometimes better equipment does produce better
> and
> >more reliable results on a more consistent basis. Would you readily
> accept a
> >prescription from an unknown drugstore that bore an unfamiliar brand
> name on
> >it and was prescribed by a doctor who had a degree from a medical
> school
> >that you never heard of and whose license to practice medicine was of
> >uncertain origins?
> >
> >
> >
>
> I would give Getty's requirements more credibility if they didn't limit
> the digital cameras to certain models and brands, but rather stated a
> resolution and sensor size (since noise is an issue).  Or what about
> ISO
> for that matter.  A D200 image at ISO 1600 may be equivalent to a
> smaller (physical sized) sensor at ISO 200 in those terms.
>
> Art
>
>
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