Sounds like you are referring to the 2nd edition of Theory of the Photographic Process. If I remember correctly, the first edition was little more than a compilation of recently published papers. I don't remember the 2nd edition. The 3rd edition has it on page 441 by Tupper, in a section where he is summarizing Jones' first excellent print test. Looking at the curve you uploaded more closely, "Negative Material B" is found on page 502 of the paper in the Journal of the Franklin Institute at the bottom half of the page. The same "Negative Material B" was used again on page 94 of Jones and Nelson's 1940 paper "A Study of Various Sensitometric Criteria of Negative Film Speeds." Personally, I like to go to the source material. It avoids some other authors interpretation of the materials.
Originally Posted by Photo Engineer
I'm sure you used derivative curves all the time at Kodak. I'm just pointing out the origins of this particular one and it was from Jones' work. I have to get a life.
Last edited by Stephen Benskin; 04-21-2013 at 10:45 PM. Click to view previous post history.