RE: Colorimeters and third-party developer support
RE: Colorimeters and third-party developer support
- Subject: RE: Colorimeters and third-party developer support
- From: Roger Breton <email@hidden>
- Date: Mon, 22 Aug 2011 13:44:40 -0400
Rich,
> Eyeballs are fine, but if the numbers are out of whack, I'll re-check my
eyeballs.
Exactly. The two must agree. I know some people who argue that, with aging,
they tend not to trust their eyeballs but the numbers. It could be an excuse
for not wanting to see the problem. It could be a real policy against
insanity. I work in an environment where, if what my clients see don't make
sense to them, then, no matter how good the numbers are, it ain't going to
fly.
> Eyeballs (and the attached brain) are known to have
> been fooled, too, and they can become fatigued, lazy and complacent.
Absolutely.
> Mine work best in the morning, after a cappuccino.
Lucky you. I wish I had enough geld to buy one of those nice expresso
machine. But, as I put all my hard-earned money on instruments, there is
little left for the expresso machine :(
> Abnormal numbers also instruct the brain where to
> focus the eyeballs to look for problems or subtle differences.
You should see what adaptation does to our perception of color.
> I think both are important and useful.
Amen to that.
> If you find a "problem" with your
> eyeballs, how do you fix it?
That is the $1000 question.
> It's useful if your measurement device can "see" the same problem and
give you the option to re-
> calibrate the monitor and/or re-build a profile to fix it. I'm not into
visually editing ICC profiles.
I've seen evidence that makes me doubt my perception where I will measure
the same patch of color on a proof and on the screen where the two
chromaticities measurements are within fractions of each other (no need for
fancy conversion to Lab to compute DeltaE here). Yet, my brain tells me that
there *is* a difference between the two because I can "see" it. Is the
difference "real" then? How do I reconcile this perceived difference with
the numbers I get from my instruments? I remember once sitting in Bob Hunt's
class during an CIC meeting in Scottsdale, a few years ago, and see my jaw
drop as he was progressively peeling elements off some specially crafted
imagery he had brought along to show us; what initially appeared as a
"yellow" shirt turned out to be "blue" in the end. We we all in shock in the
room after this presentation. So I don't debate (and I wish I understood)
some of the higher cognitive phenomenon going on in our brain as we
experience color. But, thank god there are some visual color differences
that agree with what instruments do measure, otherwise, I think I would
start selling hot dogs for a living... In the end, because of the
limitations of the tools I have at my disposal, I confess I am often forced
to accept basic white point edits as a way to obtain better visual
agreements between monitors I calibrate for a living and hardcopy color.
Because of light booth deviations from D50, because of inkjet inks
inconstancies or fluorescence or other measurable effects, you name it.
Best / Roger
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