[argyllcms] Re: Problems with i1 display LT -- far too pink
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 22 Nov 2011 12:16:03 +1100
Chris Dennis wrote:
> Standard incandescent 60W bulb:
>
> Result is XYZ: 31.292752 35.469109 5.504673, Yxy: 35.469109 0.433019
> 0.490810
> Ambient = 111.4 Lux, CCT = 3647K (Delta E 73.820146)
> Suggested EV @ ISO100 for 111.4 Lux incident light = 5.5
> Closest Planckian temperature = 2337K (Delta E 52.215924)
> Closest Daylight temperature = 2244K (Delta E 55.816505)
I'd say your instrument is broken then, since the distance to
the Plankian locus is so much larger than my instrument, and
miles from what a perfect instrument should be.
> Incandescent 'daylight' 100W bulb, nominally 6500K:
> Philips 'Genie' 14W compact fluorescent:
Hmm. Without some knowledge of what the spectrum is for these
lamps, the numbers don't mean much unless one has exactly the
same lamp.
The beauty of a standard incandescent lamp is that it's
spectrum is quite close to Planckian, and the color temperature
is pretty consistent, since it's based on the melting point
of tungsten and the design life. You wouldn't want to rely on
this for calibration, but it's good enough for a sanity check.
Graeme Gill.
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