Re: Gum calibration (was: Paper negatives- Ink Selection)
Sorry Katherine (and Mark), but it doesn't make sense to me why ink would not be a factor. Certainly inks are different. And certainly the amount of ink the printer discharges can vary, or there wouldn't be so many paper profiles. We are talking ink on paper where before this group used to talk about silver on film base. Certainly the amount of silver is a major factor when printing with traditional negatives. Keith On Fri, Oct 17, 2008 at 7:25 PM, Katharine Thayer <kthayer@pacifier.com> wrote: > > 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: > > ender100 wrote: >> 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. > > Katharine > > > > > 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 <mail@loris.medici.name>: >> >>> 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. >>> >>> >> > >
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