[HUG ] Re: Thank you in advance :D

DEAR PATRICK,

            I knew Ron well and had met Andrew a number of times but I
believe he was a lecturer when I was there.  

            I am still using my Epson 4990 for now.

                        CHEERS!

                                    BOB

 

  _____  

From: hasselblad-bounce@xxxxxxxxxxxxx
[mailto:hasselblad-bounce@xxxxxxxxxxxxx] On Behalf Of Patrick St.Cin
Sent: Tuesday, May 12, 2009 12:49 PM
To: hasselblad@xxxxxxxxxxxxx
Subject: [HUG ] Re: Thank you in advance :D

 

Bob,

 

PPHS '83 - Dr.s James and Todd were already retired from teaching by the
time I arrived.  Ron Francis was Chairman and John Carson was still there.
Carson eventually retired and John Schott came on board as his
replacement...since his arrival the department has a full Remoting Sensing
curriculum and a Color Science Chair for a PhD program (not sure if this is
still running).  I'm not sure if you ever met Dr. Davidhazey but he is the
current Chairman and an old clasmate of mine,  Dr. Bruce Smith (MS-PPHS'83)
is the Chair of the Micro-Electronics program at RIT.

 

Even though Dr. James was retired, I was lucky enough to hear him lecture on
the topic of "Serendipity in Research".  You must have had a great time
learning photo science from him.

 

Sensing strips and curves, wow, I haven't really worked with them in decades
(semiconductor processing relies on a step not a curve) but the concepts are
the same (as evidenced by the number of RIT grads that are working in the
semiconductor industry).

 

BTW, the Nikon 8000 scanner was been sold!  What did you finally do for a
scanner?
 

Patrick St.Cin
STC Enterprises, Inc.
www.imagesbypatrick.com
Tel (505)239-3026
Fax (505)771-8388 

 

 

  _____  

From: BOB KISS <bobkiss@xxxxxxxxxxxxx>
To: hasselblad@xxxxxxxxxxxxx
Sent: Tuesday, May 12, 2009 10:10:25 AM
Subject: [HUG ] Re: Thank you in advance :D

DEAR PATRICK,

            When at RIT I think I already mentioned that Dr T. H. James was
the lecturer in the Theory of the Photographic Process course that was part
of my curriculum.  I also had Hollis Todd for sensitometry and Todd and
Rickmers for statistics, Drs. Carroll (sp?) and Francis for Photo Chem and
John Carson for Optics, both undergrad and grad.  Pretty heady crowd.  

            I have in my notes that James lectured on the fact that films
were designed and formulated to have not only different contrasts and speeds
(yes, always influenced by developer etc) but also to have different shaped
curves for different applications.  For example, the old Tri-X had a
relatively straight line in most developers with a relatively short toe
while Tri-X Professional had a much longer toe for the same development
conditions.  Some films had almost no toe and very low base plus fog and
some had almost no straight line at all.all the results of emulsion design
and formulation.  

            Sooooooooooooo, it is more than designing and formulating an
emulsion for different contrasts and/or changing the development conditions
to vary those contrasts.there were films designed and formulated with
purposefully different curve shapes.  And this is even more so when
considering manufacturers other than Kodak.  

            This results in scene brightnesses being rendered as very
different tonalities (even if developed to the same gamma or contrast index)
depending on which film you use (and this doesn't even take into account
spectral sensitivity differences)!  I used to refer to it as a different
"rendition of light" from one film to another.  Of course this assumes
standardizing everything else, like printing conditions etc.  

            This also begs the answer to the question that I deduced around
1972, that certain films in certain developers printed more beautifully on
certain papers with certain developers.  E.g. Panatomic X in D-76 used to
print beautifully on Polycontrast Rapid but looked harsh on Brovira where as
Tri X in D-76 looked GREAT on Brovira.  Yes, I know, I know, I should have
made a tonal rendition system of curves but I was just happy with the
results.  

                        CHEERS!

                                    BOB

 

  _____  

From: hasselblad-bounce@xxxxxxxxxxxxx
[mailto:hasselblad-bounce@xxxxxxxxxxxxx] On Behalf Of Patrick St.Cin
Sent: Tuesday, May 12, 2009 11:22 AM
To: hasselblad@xxxxxxxxxxxxx
Subject: [HUG ] Re: Thank you in advance :D

 

Mark,

 

The reason that the films have different shaped curves is becuase they were
developed to provide different contrasts...may be you should read Grant
Haist's book on "Modern Photographic Processing".  It is a definitive
treatese on photographic films and process chemistry.  Dr. Haist was one of
the top researchers at Eastman Kodak.  Last time I bought a copy it was a
mere $110, 25 years ago.  If that's not sufficient how about try  Mees and
James, "The Theory of the Photographic Process". C. E. K. Mees was director
of research at Kodak, and James was one of the most senior researchers along
with Grant Haist.  That's a fun one to read as well...silver imaging,
contrast curves, effects of grain size on sensitivity hence contrast...boy
does that bring back the days of wine and roses at R.I.T.

 

Patrick St.Cin
STC Enterprises, Inc.
www.imagesbypatrick.com <http://www.imagesbypatrick.com/> 
Tel (505)239-3026
Fax (505)771-8388 

 

 

  _____  

From: Mark Rabiner <mark@xxxxxxxxxxxxxxxx>
To: " hasselblad@xxxxxxxxxxxxx " < hasselblad@xxxxxxxxxxxxx >
Sent: Monday, May 11, 2009 3:14:22 PM
Subject: [HUG ] Re: Thank you in advance :D

- films have different shaped curves Terry that's really not contrast.
Some call the middle part "gamma". And on and on.


Mark William Rabiner



> From: terry lindquist <tsll@xxxxxxxxxxxx>
> Reply-To: "hasselblad@xxxxxxxxxxxxx" <hasselblad@xxxxxxxxxxxxx>
> Date: Mon, 11 May 2009 13:25:01 -0500
> To: "hasselblad@xxxxxxxxxxxxx" <hasselblad@xxxxxxxxxxxxx>
> Subject: [HUG ] Re: Thank you in advance :D
> 
> ...it really is a "combination" of both type of film  & how it is
> processed (time & type of developer...)...not just processing, alone.
> 
> terry
> 



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