Digital BW, The Print

He is THE REASON why I have said nothing on this fprum. Why bother, if 
every statement will be turned upside down - and against you.
---
I guess it's a role af the moderator to cut short the threads which 
become tiresome and lead nowhere.
 Jack

Jon wrote:

> > Message: 10
> > Date: Fri, 28 Nov 2003 11:52:28 -0800
> > From: "Paul D. DeRocco" <pderocco@...>
> > Subject: RE: Re: RGB Convert to Grayscale
> >
> >> From: Anthony G. Atkielski [mailto:anthony@...]
> >>
> >> RGB is worse because it collapses all the spectral energy of the
> >> original scene into just three numbers.  There is no way to restore 
> that
> >> spectral distribution from those three numbers.  True black and white
> >> capture (be it electronic or film) captures an image as a function of
> >> the continuous spectral sensitivity of the capture medium and the
> >> continuous spectral emission of the image being recorded.  There is no
> >> way to simulate that continuous function with just three numbers.  So
> >> there exists an infinity of black and white scenes that cannot be
> >> accurately reproduced using a conversion from RGB.
> >
> > Excuse me, but black and white film "collapses all the spectral 
> energy of
> > the original scene" into just one number.
> >
> > In theory, you can certainly acheive results with a narrowband filter in
> > front of B&W film that cannot be attained precisely by using an RGB 
> sensor
> > and Photoshop. However, there are some practical problems:
> >
> > 1) You only get one particular result with a particular filter. Once 
> it's in
> > the B&W domain, you've lost all ability to make adjustments to 
> anything but
> > the grayscale.
> >
> > 2) You can't see the results of your filter choice until hours later.
> >
> > 3) The commercial filters used for B&W photography aren't narrowband 
> anyway.
> > The blue and green ones are no more narrowband than the filters in a
> > digicam. The red and yellow ones are actually low-pass filters.
> >
> > You may indeed like the results you get with filters and B&W film, but
> > there's no ground on which to argue that these results are 
> unquestionably
> > superior or more correct, or contain more information.
>
> Paul,
>
> He isn't arguing in order to prove you _wrong_... he is arguing with you
> because he wants to _argue_.
>
> This is a guy who argued on USENET for days that you can get a better
> understanding of the optical performance of a particular lens by 
> reading the
> manufacturer's MTF curves over actually using the lens.
>
> He doesn't do B/W inkjet printing--he is here to fan the flames. Look 
> at the
> archives for the other capture spats-- you will see his posts, ad nauseum.
>
> Oh yeah, you might want to ask if he actually has any experience with
> digital capture...
>
> Jon
>
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-- 

_________________________________________________
Jack M Kucy
JMK Gallery (www.jmk-gallery.com)
917-991-2096     jmk@...
Member of ASMP (www.asmp.org)
_________________________________________________
...a riveder le stelle




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