RE: Colorsync-users Digest, Vol 2, Issue 183
RE: Colorsync-users Digest, Vol 2, Issue 183
- Subject: RE: Colorsync-users Digest, Vol 2, Issue 183
- From: "Mark Rice" <email@hidden>
- Date: Fri, 6 May 2005 13:12:08 -0400
- Organization: Zero One
I have no doubt that flourescent light sources are spiky, which can cause
many instrumentation problems. But as well as scientific experience, I also
have 25 years of experience of looking at pictures under many lightboxes.
The purpose of intstrumentation is to help us evaluate what we see, but what
we SEE is the final product.
When both myself, and Bob McCurdy, one of the owners of GTI, report that the
light source appears to be getting bluer when intensity is reduced, then I
believe that our eyes are correct - whether "bluer" is indicated by color
temperature, or CRI, or whatever - it is BLUER. That is what really counts.
If we gathered 1000 people, and 99% reported it was bluer, and instruments
reported it had a lower color temperture, I would say there was something
wrong with the instrumentation protocol.
By the way, I have an OTT lite here, and the eye-one reports that it has a
CRI of 99, and a temp of 5003K. Compared to the GTI, it looks green. I am
not sure what green is on the color temperature scale, but I have not been
able to get my monitor to match it. So I don't know what that means.
Also interesting is this: I can get the monitor to match the GTI
visually,the eye-one (using GM PM) reports the light box as 4700K and the
monitor at 5900K! What does that mean? I am not going to match the color
temp numbers as the instrument tells me - I would be looking at ridiculously
mismatched images. So I conclude that the eye-one or the software is not
reporting a useful value with color temperature. The instrument IS very
useful in creating color profiles - that works for me.
Mark
-----Original Message-----
From: Andrew Rodney [mailto:email@hidden]
Sent: Friday, May 06, 2005 12:43 PM
To: email@hidden
Subject: Re: Colorsync-users Digest, Vol 2, Issue 183
On 5/6/05 10:32 AM, "Mark Rice" wrote:
> Except for the fact that the color temperature meter reported what
> our eyes saw - and the eye-one contradicted it!
Put two different pieces of paper under the illuminate that is measuring the
same (with the color meter or the Spectrophotometer). Look at one, then the
other. Look at both at the same time. If your eyes don't adapt to the white,
you have a brain tumor <g>.
There are all kinds of situations and reasons why what you saw wasn't an
accurate indication of what's happening. That's why we use such instruments.
The color temp meter was wrong (or to put it another way, it reports one
value that can be vastly different colors). Your eyes are not much better.
If all light sources were true blackbodies a particular color temperature
would produce the same color of light. Because natural materials are not
theoretical blackbodies, heating them to a specific temperature creates
deviates from the theoretical color from magenta to green. So your meter
could tell you 5000K and you could have many colors along this axis from
magenta to green that are different colors, all producing the same numeric
value. The illustration enclosed shows this.
Andrew Rodney
www.digitaldog.net
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