Duv is an euclidean distance on a 2D plane
considering both the horizontal and vertical
axes. This includes tint, but isn't a specific
measurement of tint
• In consumer lighting, CCT includes a stated
or implied emitter technology,
if at all, the similarity to such a technology.
In practice it's just a rough indication of the
shift on the blue-yellow axis. They don't
usually give the tint, but often they do give
an (also more obsolete than not) CRI. This is
more of an aid for a buying decision, not a
specification of a technical property. The
accuracy of such indications doesn't feel very
confident.
A better version of CRI is called IES TM-30, which provides a specificArgyll's "visual" temps with dE'00 offsets
are a nice way of transcending the arcane
dimensions of Duv and focusing on white
perceptual tracking.
Yes. while dE2000 is much closer to human
perception than Duv (and the CAM closer than
dE2000), this is an enhancement. But it still
doesn't imply any particular spectrum, which is
what perfectly characterizes a light source. So
to make it a defining characteristic for usage,
a better version of CRI would still be needed,
if you need to avoid the spectrum.
Yes. Yes. Yes, these answers are spot on. Lighting designers, installers,However, I imagine that if you ask a lighting
technician what he thinks about the "visual"
measure, he'll probably have no idea what
you're talking about, unless if he's up to
speed on LED tech.
I would expect him to know, as there are heavy
consequences of that. If he has to design the
display of products for sale, he'll want to
show the colors as they are, and not in a muddy
unpleasant way, right? And I believe, that this
is the justification for my question.
I take Ben Goren's points about the fuzziness
of desirable camera behavior very well,
because he keeps in mind a distinction of
artistic intentions from quantitative
measures while avoiding disservice to either
point of view.
Artistic or commercial, the point is how a
light source is rendering a reflective color.
As soon as we care about that color for
artistic reasons or not, it's relevant in spite
of the fuzziness (which can only be eliminated
going back to the spectra).