[Tig] Discussion of scanners
andreas at filmtek.no
Fri Feb 12 21:03:56 GMT 2016
Ted, what cameras/sensors are in the MWA scanners?
And does anyone know what's in the Scanstation?
Filmtek AS <post at filmtek.no>
Filmshooting | Com - http://www.filmshooting.com
Tel: (+47) 38 17 99 16
On Feb 12, 2016, at 8:20 PM, Jeff Kreines - Mindspring via Tig <tig at colorist.org> wrote:
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>> On Feb 12, 2016, at 11:27 AM, Grace McKay via Tig <tig at colorist.org> wrote:
>> Thanks Andreas. I didn't mean to kill the conversation about scanners with my question. I will surmise that the choice of cameras is in the "Secret Sauce" category of information, and not to be shared. I would guess that most are in the 4k-5k range of industrial/scientific camera, with larger formats being better, as the pixel size can be larger. In any case these various scanners are all high-quality, with similar feature sets.
> We have been using factory-modified machine vision cameras, as others do, in combination with proprietary GPU-based signal processing. So far we have not found any CMOS sensors that have enough dynamic range to approach the quality we have been getting from high-end CCD sensors. Of course, with CCDs there’s a trade-off between scanning speed and resolution.
> Some manufacturers are using a 5K CMOS camera that can capture at up to 30 fps (with a huge RAID to keep up with it) but the sensor in this camera, while fast, can not approach CCD quality — especially apparent when scanning contrasty material — prints and reversal originals.
> We are working with a manufacturer on a new 6K camera with very good dynamic range that looks promising, but it’s probably a few months off.
> That’s why we make it possible for Kinetta users to swap out the sensor module in less than a minute — as better sensors come along (and they will) we can accommodate them (the good ones, anyway). Unlike some other scanners, the user can adjust sensor and lens position to make the best use of the available resolution. Some archives prefer to scan everything edge-to-edge, preserving the optical track and any ephemera and edge markings. A good example of this is the USC Newsfilm Archive — they have a collection of 1926-1934 Fox Movietone outtakes — original camera negatives with variable density (AEO-Light) sound. They scan everything edge to edge.
> My (very biased) advice is to choose a sensor that is easily upgradable as far as sensors go, and not get stuck with the sensor technology that was current when the scanner was manufactured. It’s a quickly-changing field.
> I’d also suggest getting a scanner you can carry in a passenger car, but that may not matter to everyone!
> Jeff Kreines
> jeff at kinetta.com <mailto:jeff at kinetta.com>
> kinetta.com <http://kinetta.com/>
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