RE: EyeOne calibration
RE: EyeOne calibration
- Subject: RE: EyeOne calibration
- From: Roger <email@hidden>
- Date: Fri, 04 Sep 2009 14:45:12 -0400
Tyler,
The champion of re-calibration during a large chart reading was by far the
Spectroscan. I think this is not even under the control of the measuring
application? The old Pictographics's ColorSynergy even allowed specifying
how often to recalibrate during a measuring session. Some instruments, like
the SpectroEye, automatically recalibrate every other 10 readings. That's
what I call ultimate peace of mind, as far as maintaining calibration is
concerned.
With regards to the EyeOnePro, I routinely use it to read the 1617 patches
of a standard IT8.7/4 chart, mounted on an iO table, in patch mode. And I
wouldn't think that it would need to be re-calibrated during that interval.
Why? Because when I read the same chart using an iSisXL, I get an average of
0,6 deltaE difference between the EyeOne's measurements, with a max well
under 3. So, either the two instruments are lying the same way about the
underlying color, or they have good inter-instrument agreement, or the
EyeOnePro's readings can actually be trusted during that large sample
patches interval. I tend to believe the later. On subsequent readings of the
same chart, with a Techkon Spectrodens and a SpectroEye, the average and max
deltaE difference was still about the same deltaE differences. So it can't
be that bad, in my opinion.
BTW, I have a Spectrocam here. Didn't think it need such frequent
recalibration?
/Roger
> Back in the days of the SpectroCam, I had to recalibrate often as the
> internal light source heated the device and altered it's performance
> throughout the course of measuring a chart. After reading here that the
> EyeOne may drift a bit and a warm up before monitor profiling was
> advised, I'm wondering it it's internal source warms enough to effect
> performance during reflective measuring.
> As my current software allows calibration any time at all during a
> session, I'm curious if anyone has any experience or opinions about the
> EyeOne's possible performance during a large chart reading, and whether
> intermittent recalibration during a chart reading may be beneficial.
> Thanks,
> Tyler
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