I don't know. They look like they have a different slope, and therefore a different contrast to me., just as in the Ilford schematic.
Regards Ralph W. Lambrecht http://www.darkroomagic.comThis electronic message contains information that is confidential, legally privileged or otherwise protected from disclosure. This information is intended for the use of the addressee only. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, printing or any other use of, or any action in reliance on, the contents of this electronic message is strictly prohibited. If you have received this communication in error, please notify the sender and destroy the original message immediately.
P don't print this e-mail unless you really have to On Nov 28, 2009, at 19:37, Nicholas O. Lindan wrote:
"Ralph W. Lambrecht"However, I'm a bit confused. On page 1 you state that all emulsions have the same contrast, but the curves on page 5 show three emulsions with three different gradients. The bottom-right graph illustrates this clearly.Ah, yes. A bit of a difugalty, I'm afraid. 'Intrinsic contrast' might be a better term - and muddy the water enough so people won't ask embarrassing questions (properly that should be 'intensive contrast' but that would be both muddy and turbulent). The emulsions have the same range of input that translates to range of output. They have different DMax because they are added to thepaper in different amounts. Which does give then different slopes in their contribution to the final HD curve.But if all three emulsions are applied in equal proportion they would all have the same slope. It's the same emulsion with the same quantity-independent contrast. The two-emulsion demonstration shows two emulsions with the same D-Max and the same intrinsic and extrinsic (extensive) contrast. Nicholas O. Lindan Cleveland Engineering Design, LLC Cleveland, Ohio 44121= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = ====================================================================== 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.
