Re: Back-exposing on plastic (was: Re: Gum transfer

From: Katharine Thayer <kthayer_at_pacifier.com>
Date: Thu, 04 May 2006 10:05:31 -0700
Message-id: <57BDDDF8-3B5B-498E-9B1E-A0092A360658@pacifier.com>

> On May 2, 2006, at 12:50 PM, Ender100@aol.com wrote:
>
>
>>
>>
>> What I am not sure I understand is if you are saying that for a
>> given mix of gum printed with one coat, changing the shape of the
>> curve will NOT allow you to get whatever tones you want between
>> the DMax of this given mix (one printing) and paper white?
>>

Sorry, I seem to have misread this sentence the first time. I
thought you were talking about the scale between DMax and DMin. What
you're saying here, that one should be able to express all the values
between DMax and *paper white*, shows even less understanding of gum
than I was supposing. Let's take a pigment mix that is so pigmented
(much more pigmented than Chris's 3 g/100 ml gum) that it can print
only one or two very dark values, regardless of what the negative
looks like; the rest of the image will be paper white (assuming that
the mix isn't so overpigmented as to cause pigment stain). It's not
so outlandish to imagine this kind of pigment mix; I used to print
this very high-contrast way early in my gum printing career, as do
many people before they understand that too much pigment gets you too
much contrast. (Someone here referred to this kind of print as "soot
and chalk" which is a great description). Surely you don't imagine
that by changing the curve, you can make this pigment mix print 256
values between black and white?
Katharine
Received on 05/04/06-11:05:37 AM Z

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