Re: Profiling negative films

["Phil.Lippincott" <phil.lippincott@xxxxxxxxxxxxxxxx>]

Hi Raffe,
   Your right about the color shifts and mini lab errors.  Many of these come
from equipment that is not maintained and in calibration.  Others from the fact
that even if the C-41 and RA-4 chemistry are right on the printing by the numbers
is done to the current demographic average of film being sold.  So Konica, Fuji
and Kodak various films are all treated to the same comparable processes by the
numbers of the current average demographics of all current films being sold.
Otherwise you have to process with unique "color film channels" for each unique
film type.  Frankly 1-hr shops, Costco and Walmart will simply keep the photo
production going not deal with the differences of any particular production job.
   When scanning we have all of the same issues when properly doing custom
negative film channels by the unique numbers for each film type and exposure
level.  This is what by the way our Aztek Digital PhotoLab software does
automatically for scanners.

Best Regards,
Phil Lippincott
www.aztek.com

Best Regards
rafeb@adelphia.net wrote:

> On 5 Jan 2002 at 0:38, Nikki Pedersen wrote:
>
> > I guess color is also in the eye of the beholder.
> >
> > Did someone mention "calibrating by the numbers?"
>
> That would be me, most likely.
>
> > I also recall a statement about our becoming conditioned to see colors as
> > the brain reasons they should appear. But what makes those 1-hr. photo labs
> > pass on such obviously color shifted prints? Aren't they printed "by the
> > numbers, too?"
>
> Yes, but a human brain, when properly applied, knows which
> numbers matter and which ones to ignore.
>
> The "blind" method is represented by (for example) Auto-Levels,
> in Photoshop.  The "smart" method is represented by a
> judicious use of the Curves tool, channel by channel.
>
> rafe b.
>
> -
> Turn off HTML mail features. Keep quoted material short. Use accurate
> subject lines. http://www.leben.com/lists for list instructions.

-
Turn off HTML mail features. Keep quoted material short. Use accurate
subject lines. http://www.leben.com/lists for list instructions.