Re: Two tricolor prints
Part of the problem is that I posted to the wrong thread regarding your curve.
I believe it was your post below that I was referring to. It sounded as if the curve you had calibrated for gum was giving you flat midtones in order to get separation in the shadows and highlights—as were examples that others had sent to you.
I was asking if you could send the curve you were working on or post it so that I could see more clearly what you are talking about—often the shape of the curve will tell you a lot about what is going on.
Precision Digital Negatives - The System
PDNPrint Forum at Yahoo Groups
In a message dated 9/26/07 10:54:34 AM, firstname.lastname@example.org writes:
Yes, but the overall low contrast is to some extent an inevitable
result of setting the density of the negative to match the scale of
the gum, which was part of my point. There's so much difference to
be made up that it's very difficult to find a curve that will replace
the contrast that you've lost, if that makes sense. If you have
any slope through the midtones, then you sacrifice separation in the
highlights or shadows or both. If you get separation in the
highlights and shadows, then your midtones have to be flat. So
far, I haven't found a curve that makes a better gum print than a
diagonal line does (for my printer, light, negative media, etc) but I
haven't given up yet.
I would think maybe I was missing something (which is entirely
possible, since while I'm generally thought of as a fairly
intelligent person and mastered statistics with no trouble, this
stuff just makes no sense to me at all) except that a number of
people have thoughtfully sent me calibration charts and curves to
show me how I "should" be calibrating my curves for gum, and these
have shown the same difficulty I'm struggling with. For one thing
they have been made with underpigmented mixes, which I find
interesting and somewhat inexplicable, but the main thing is that the
post-curve step tablets seem to follow the same pattern: say in a
101-step chart, the steps from 1-10 or so show nice gradation, and
the steps from 85 or 90 to 100 show good gradation, but all the steps
from 15-85 are the same tone. And the curve reflects that exactly: a
slope in the highlights and shadows, but horizontal through the
midtones. Or, they have to lighten the highlights too much in order
to leave room for a slope in the midtones. No matter what you do,
something has to give. So I'm still struggling with that
fundamental difficulty with making curves for gum.
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