Archived posting to the Leica Users Group, 2007/07/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henning that is concise and informative. Thanks. I think that there were
several overlapping issues being discussed. I was
expressing my thoughts regarding capturing all channels rather than a grey
scale image (I scan), the utility of a UV filter for
reducing the effect of distance haze and the flexibility of what can be done
in Photoshop if no original information is thrown away.
I understand what you have explained regarding strong filter effects, good
colour balance from 2000?K scenes and polarizer effects
requiring a filter. That makes perfect sense.
Cheers
Hoppy
-----Original Message-----
Subject: Re: [Leica] Query re B&W photography in digital
I re-read what I posted, and it's obvious I wasn't clear.
So:
You can't achieve most filter effects in post processing. That is it.
You can approach many subtle effects, and effects
that have similar results to filtering exactly
the same colours as the Bayer pattern filters,
but no more than that. No sharp cutoff filters
can be emulated to any useful degree; no strong
filters of whatever colour. You have to filter
before the light hits the sensor, or film.
That is why there is this whole mess with the
IR/UV cutoff filters on the M8; there is no way
to really handle this in post processing. Once
the wrong information hits a certain sensor
element, it can't be distinguished from the other
information. Remember, sensor elements are only
buckets that collect photons; all the information
that the sensor element reports is the number of
photons, not the wavelength that it came in on.
If you want strong filter effects, good colour
balance from 2000?K scenes, polarizer effects -
use a filter. You can't get the effects through
post processing.
--
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:henningw@archiphoto.com
|[ ]| http://www.archiphoto.com
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