Archived posting to the Leica Users Group, 2007/07/19

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Subject: [Leica] Query re B&W photography in digital
From: hoppyman at bigpond.net.au (G Hopkinson)
Date: Thu Jul 19 16:17:49 2007
References: <f315fa825bb8.469ba84e@shaw.ca><000601c7c80c$6a937580$6400a8c0@corp.nortel.com><003401c7c818$73d1d450$5b757cf0$@net><60912D20-D279-4E5B-8E37-65DAB706C59D@comcast.net><5C5E0A6D-C97F-423D-ACD0-10846081B61C@comcast.net><98C2B7DB-F250-44AF-9AC1-ED22C6627C7F@mac.com><6b9bd80a0707171040l3824c5d2h52f0e6c5d7fc84e7@mail.gmail.com><42DC5777-57D3-4395-A9C2-4CC271873FBF@comcast.net><D9086827-8F20-4543-BE8B-D186A48FD68D@mac.com><p06230906c2c2bc7ae11d@[10.1.16.144]><7577161B-D98F-4267-B812-F65805F5F0C8@comcast.net> <p0623090bc2c52eb037f8@[10.1.16.144]>

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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In reply to: Message from gregj.lorenzo at shaw.ca (GREG LORENZO) ([Leica] Leica R Lenses on You're M8)
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Message from tomschofield at comcast.net (Tom Schofield) ([Leica] Query re B&W photography in digital)
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Message from tomschofield at comcast.net (Tom Schofield) ([Leica] Query re B&W photography in digital)
Message from imagist3 at mac.com (Lottermoser George) ([Leica] Query re B&W photography in digital)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] Query re B&W photography in digital)
Message from tomschofield at comcast.net (Tom Schofield) ([Leica] Query re B&W photography in digital)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] Query re B&W photography in digital)