Re: Gum calibration (was: Paper negatives- Ink Selection)
Keith, I've said this before, but since it keeps coming up I'll say
it one more time: if your goal is to reduce exposure times, this
isn't the most fruitful place to look IMO.
Mark has pointed out that exposure time isn't a function of printer,
ink type, ink color or printer settings:
> Exposure time does not depend on the printer, ink or color of the
> negative—it merely depends on the substrate you are printing
> on—providing all other variables are equal.
and logic says that exposure time can't be a function of curves,
since the exposure time is established before the curve is
calibrated, and doesn't change after the curve is calibrated.
Exposure time is a function of a lot of things such as light source,
dichromate concentration, pigment concentration, paper speed,
environmental conditions; how the negative is generated is not a
significant factor, in my experience.
On Oct 17, 2008, at 12:00 PM, Keith Gerling wrote:
It helps. The negatives are pretty dense. When you started to talk about negative density I was getting concerned. The only Pictorico negatives I've actually held in my hand were some made by Sandy King and I was astonished that he was able to get such a range of tones from something that looked so "thin". Your paper negs don't look any different from mine. 2008/10/17 Loris Medici <firstname.lastname@example.org>:17 Ekim 2008, Cuma, 5:50 pm tarihinde, Keith Gerling yazmış:... I'd be very interested in seeing a snapshot of one of your un-oiled negs, if that would be possible. Just something that give me an idea of your range of tones.See here: 1. http://tinyurl.com/68txaw (full 400dpi scan downsized to screen resolution) 2. http://tinyurl.com/698az2 (100% crop of the 400dpi scan) Hope that helps somehow... Regards, Loris.