Digital BW, The Print

On 29/5/03 8:47 am, "DigitalBlackandWhiteThePrint@yahoogroups.com"
<DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

> does anyone know the reason why it won't work on films other than
> C-41 process films?

As I understand it Digital ICE and similar software cannot distinguish
between dust and the clumps of silver grain that make up the image in older
'classic' silver-rich films. Tabular grain B&W (T-Max) films have a flatter
grain structure and _should_ _theoretically_ work better.

In Chromagenic film the silver based image replaced during processing (C41)
with 'dye clouds' and so the software can distinguish more readily between
the dust specks and the 'softer' less granular image on these films.

--
Regards
David Prakel

Centre of Britain PhotoWorkshops Partnership
www.photopartners.co.uk

Hello David,
Does this Replacement process decrease the resolution in the final 
image when compared to normal BW silver film ??
Thanks,
Alex


> 
> In Chromagenic film the silver based image replaced during
processing (C41) with 'dye clouds' ............

> Regards
> David Prakel
>

No more than replacing with dyes in E-6 or C-41 does. 

Seth

=-----Original Message-----
=From: B. Alex Pettit Jr. [mailto:a_pettit_jr@...] 
=Does this Replacement process decrease the resolution in the final 
=image when compared to normal BW silver film ??
=Thanks,
=Alex
=
=
=> 
=> In Chromagenic film the silver based image replaced during
=processing (C41) with 'dye clouds' ............
=
=> Regards
=> David Prakel

On 29/5/03 6:43 pm, "Alex Pettit Jr"
<DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

> Does this Replacement process decrease the resolution in the final
> image when compared to normal BW silver film ??

Nope. Best think of it as each dye cloud sitting where a 'grain' of silver
halide would have been. Same resolution, less appearance of granularity.

--
On 30/5/03 5:00 am, " DigitalLipothymy@..."
<DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

> that makes sense. i have only had one experience with C41 B+W
> film, and had it developed at a local lab, and when i got it back, i
> was surprised to see that instead of true B+W, it had more of a
> Sepia tone to it. is this normal, or a mess up at the lab?

Depends on which chromagenic film you use - some still have vestiges of the
orange mask familiar from C-41 colour negs. Some are much more like B&W
negs.

Depends on use as some chromagenic B&W films are deigned to be printed to
colour paper for faux B&W prints while other films are designed to be
printed on conventional bromide papers in an enlarger. The former tend to be
me more 'orangey' than the latter. Scanning isn't a problem and printing in
the conventional darkroom means, usually, a harder grade of paper.

--
On 30/5/03 5:00 am, "derek_c@..."
<DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

> So it ought to work on the chromogenic films, i.e. TMax and HP5, as these
> work like colour film and the silver is replaced by dyes during
> processing.

T-Max is a 'new generation' tabular grain silver halide film - it's spectral
response modified by dyes. This is why the wash water is all magenta and why
some people think it is chromagenic. T-Max developer is not C-41 process and
T-Max can be developed (preferably in my opinion) in conventional developers
like D-76/ID-11, X-tol or Ilfosol.

HP5 is a 'classic' silver film and is not chromagenic. As the size of its
final grain is close to the size of dust specks I would think this would be
the least likely film to work with dust removal software in a a scanner.

--
Regards
David Prakel

Centre of Britain PhotoWorkshops Partnership
www.photopartners.co.uk