Re: solarized gums?
On Feb 14, 2007, at 10:01 AM, Katharine Thayer wrote:
http://www.pacifier.com/~kthayer/html/Pthalostrength.htm
Sorry, I'm told this doesn't link; the "l" got left off "html." try
this:
http://www.pacifier.com/~kthayer/html/Pthalostrength.html
if anyone's interested in looking at that page.
kt
On Feb 13, 2007, at 12:21 PM, Loris Medici wrote:
Hi Katharine,
This (as Ilana describes) is no doubt the phenomenon you name
"tonal inversion". I've read the page that you wrote about this
issue again and don't agree with you in:
"...The remedy, of course, the way to eliminate the tonal
inversion, is simply to reduce the pigment/gum ratio..."
Because I've experienced the same effect with a lightly pigmented
blue 31-step tablet print before. See:
http://www.loris.medici.name/Gum-Test-01.jpg
The scan doesn't show it well but, to my bare eyes there's
definitely paper white at steps 18, 19 (and maybe 20) + there's
definitely tone (where there shouldn't be) at steps 20+.
I guess we'll agree that the pigment concentration I used on that
print is not excessive since that is easily judged by the scan ->
this is Phtalo Blue; as we all know, this is a dark pigment with
immense covering power...
Regards,
Loris.
--------
Hi Ilana,
My own experience, observations and tests don't support the notion
that failure to clear (aka pigment stain) is a function of
underexposure, so I wouldn't agree with your tentative conclusion
that "parts that should clear are not, because they have not
received enough light." If you're interested, some test strips
showing the lack of relationship I found between stain and
exposure are here:
http://www.pacifier.com/~kthayer/html/stainexposure.html
It sounds like what is happening to your highlights, if I
understand the description accurately, is a phenomenon some people
call "tonal inversion." For my take on this phenom, see
http://www.pacifier.com/~kthayer/html/tonalinversion.html
Hope any of that is useful to you,
Katharine
|
