Re: Viewing lights
Re: Viewing lights
- Subject: Re: Viewing lights
- From: Graeme Gill <email@hidden>
- Date: Tue, 10 Oct 2006 18:12:27 +1000
Steve Clark wrote:
How are you measuring the temperature? Does anyone on the list have any
comments on the accuracy of measuring the output of a viewing booth
with the i1?
Something I've noticed is that the traditional way of measuring color
temperature (Correlated Color temperature), doesn't correspond to
the closest visual temperature match, if the color doesn't actually
lie on the blackbody locus. This is because it uses a rather ancient
measure of delta E, which is the difference in CIE 1960 UCS space.
Measured using a more modern Delta E (like CIEDE2000), can produce a
noticeably different result.
For instance, the CCT of a CIE "F5" fluorescent light, is
6341K. The CIEDE2000 closest black body temperature is actually
5900K. This is a difference of nearly 17 Delta E.
That is a particularly bad example though.
An F8 has a CCT of 4995K, while it's CIEDE2000 temperature
is 4896K, an error of 2.5 Delta E.
Another "gotcha" is that CCT measures to the closest point on
the black body locus, while many standards refer to the daylight
color temperature, which is not quite the same thing.
Graeme Gill.
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