> 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Arthur Entlich > Sent: Wednesday, July 04, 2007 6:49 PM > To: [EMAIL PROTECTED] > Subject: [filmscanners] Re: film and scanning vs digital photography > > > > [EMAIL PROTECTED] 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 > > > ----------------------------------------------------------------------- > ----------------- > Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe > filmscanners' > or 'unsubscribe filmscanners_digest' (as appropriate) in the message > title or body ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body