----- Original Message -----
From: "Shannon Stoney" <shannonstoney@xxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, February 27, 2010 11:51 AM
Subject: [pure-silver] contrast changes
I've been making "work prints" for the first time: that
is, enlarging to a print on 8x10 paper and getting
contrast right before bumping up to the more expensive
11x14. Usually this works pretty well. But in my last
printing session, it didn't: the big print looked a lot
"flatter" than the little print, which looked fine, at the
same paper grade.
I guess I could have agitated less, but I made two big
prints and made a point of agitating the second one so
that this wouldn't be a problem. Could larger paper be
subtly different in contrast? Or could a bigger print
just "look" flatter?
--shannon
Shannon, I think this is an optical illusion, its
fairly well known. One way of proving it is to overlay the
small print on the large one and see if there is a visible
difference in the shadow densities. The eye is pretty good
at matching brightness of adjacent areas so one can make
such comparisons visually with good precision.
There may be other effects such as a reciprocity
failure in the paper but the comparison should helf find if
that is happening.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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