[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
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
> 



=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your 
account (the same e-mail address and password you set-up when you subscribed,) 
and unsubscribe from there.


__________ Information from ESET NOD32 Antivirus, version of virus signature 
database 4068 (20090512) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

Other related posts: