PanoTools NG:
Re: Re: Canon 5D MKII
Keith Davison 2012-Mar-17 19:01:31
> Surely there is also interpolation in film scanners. In many ways a
> digital camera is just a differently organized scanner which scans the real
> world instead of film.
There will only be interpolation in a film scanner if you chose a resolution which is not the
true optical resolution of the scanner, or a resolution which is not a full divisor of the optical
resolution.
Most film scanners do not use Beyer filters, the scan array is generally a triple "stripe" of
R,G and B filtered sensors, some older scanners have only one "stripe" of sensors and
make three passes with colour-filtered illumination (eg, Agfa Vision 35).
Apart from large format scanning backs (and scanning panoramic cameras!!!), most
camera sensors do not "scan" the real world at shutter speeds lower than their flash syncs,
the whole image is captured in one go. It could be argued that at shutter speeds higher
than the flash sync, the moving shutter slit does scan the sensor, in a fashion.
Generally scanning involves using a small sensor to repeatedly sample small areas of a
subject and assemble the output into a much larger "image". Some high-end pre-press
scanners were actually X-Y scanners, a small square sensor being moved in both
directions to obtain the scan.
KeithD
------------------------------------
--
<*> Wiki: http://wiki.panotools.org
<*> User Guidelines: http://wiki.panotools.org/User_Guidelines
<*> Nabble (Web) http://panotoolsng.586017.n4.nabble.com/
<*> NG Member Map http://www.panomaps.com/ng
<*> Moderators/List Admins: #removed#
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/PanoToolsNG/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/PanoToolsNG/join
(Yahoo! ID required)
<*> To change settings via email:
#removed#
#removed#
<*> To unsubscribe from this group, send an email to:
#removed#
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/