Re: Neutral grey under different lighting
Re: Neutral grey under different lighting
- Subject: Re: Neutral grey under different lighting
- From: Scott Martin <email@hidden>
- Date: Sun, 2 Sep 2007 20:27:01 -0500
in evaluating photographic labs I had them printing graduated gray
gradients to see how neutral their process is (and check for
potential black and white cut-offs).
You'll find that the type of profile they use effects the gray
balance. GMB PMP profiles are visually cooler than MonacoProfiler
profiles for example. Many labs prefer the MP's profiles for this and
other reasons.
What I have noticed is that the prints looks more or less neutral
at daylight (between 5000 and 7000 K according to my Eye-One) but
have a pinkish/magenta-ish cast when viewed under normal
fluorescent office light (about 4000 K). Interestingly, my standard
grey reference card shows none (or much less) of these differences.
Fuji Crystal Archive and Kodak Endura are surprisingly susceptible to
metamerism - more so than modern inkjet inks. I suspect this is what
you are seeing and it is common. Less archival papers like Kodak
Royal are less susceptible to metamerism yet less archival.
I know color photographic paper will never produce a perfectly
neutral grey but is this effect common with photographic paper or
should calibrate my eyes?
"Perfectly neutral" is a fun topic of discussion. Labs have the
choice of shooting for colorimetrically neutral, one that follows the
paper gray axis, or a slightly warm neutral (something like LAB b=+1)
like their silver halide black and white papers. All things said, I
think you should expect to see a print that looks perceptually
neutral. Metamerism aside, photo paper gray should be very nice.
Scott Martin
www.on-sight.com
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