Re: Exposure times in tricolor gum
Neat that you find this out, too, Henry. And that you find the exposure times to be longer for Y, less for M and less for Thalo because that corroborates "across the pond" and with very low humidity here, etc. etc.
Yellow and carbon black seem to be pretty "straight line" for me, fairly close, and magenta and thalo are very close. Thalo is such a fast color, even when deep. It goes to show that the old timers were correct when they said colors printed at different speeds.
That never made sense to me (why colors would have speeds) until seeing the effect through PDN that different colors of negatives printed faster and slower, and then realizing that this would be true of pigments. But it is surprising, the curve shapes of the different pigments are so drastically different.
Christina Z. Anderson
----- Original Message ----- From: "Henry Rattle" <firstname.lastname@example.org>
Sent: Tuesday, November 18, 2008 6:24 AM
Subject: Re: Exposure times in tricolor gum
Yes, the Y curve is quite a lot closer to the 45 degree line - less sigmoid
than the cyan and magenta curves, which are close to identical.
Afraid I mix the pigment by eye - small blob, larger blob... So can't be of
much help there.
On 18/11/08 12:50, "Loris Medici" <email@example.com> wrote:
Thanks Henry, By "...Y is much flatter..." you mean that it's closer to the ideal 45 degrees linear transfer function or it's more drastic? I'm currently printing using a single curve devised from M tests. What can you say about the pigment concentrations you use? Regards, Loris. 18 Kasım 2008, Salı, 2:43 pm tarihinde, Henry Rattle yazmış:Hi Loris,