Re: Monitor Calibration
Re: Monitor Calibration
- Subject: Re: Monitor Calibration
- From: edmund ronald <email@hidden>
- Date: Sat, 14 Nov 2009 21:34:50 +0100
Ok Andrew, here are my two posts, again.
1.------------
If you are amortizing the calibrator over several displays, then i1Pro
hardware is what you want. This is a spectrophotometer, not a
colorimeter, an expensive instrument, and a carefully manufactured and
tested device. If you don't drop it, it won't let you down.
2---------
I'm not saying that a spectrophotometer is better than a correctly
calibrated well-matched colorimeter, I'm saying that the odds are that
a random off-the-shelf i1 Pro will work better with a *collection* of
monitors than a random off-the-shelf i1 display.
Edmund
-----------
Together these posts clearly indicate that I am considering both the
issues of matching the instrument to an unknown set of unknown type of
displays, and of inter-instrument agreement which are experimentally
tabulated in J.Raimar Kuhnen-Burger's contribution to this list. And
the issue of instrument fragility, which has been forgotten by many.
Seeing that so far I only designed one instrument (for fun), I'm quite
aware that I'm not exactly an experienced color scientist, and
certainly not the sharpest knife in this box, but that doesn't mean I
enjoy being called the dullest.
Last, not least, I don't think anyone deserves scorn for suggesting
that the i1Pro deserves its reputation as the industry workhorse.
Sorry, this instrument is one case where Xrite has done well on both
design and production. And after I yelled at them enough they did
improve the ruler :)
Edmund
On Sat, Nov 14, 2009 at 5:49 PM, Andrew Rodney <email@hidden> wrote:
> On Nov 14, 2009, at 12:18 AM, Graeme Gill wrote:
>
>> That is a rather carefully worded document for the most part, that
>> doesn't actually claim that a spectrometer is always inferior to a
>> colorimeter...
>
> Because as Robin and Karl point out, that isn’t always the case.
>
> In terms of calibration of my wide gamut units, an off the shelf i1 Display-2 is off by at least CCT 500K in nailing the white point using an NEC SpectraView and host software. The EyeOne Pro isn’t. One could argue the Spectrophotometer is superior. As Robin and Karl point out, on the same display, the i1 Display-2 is producing better results in darker tones. One could say the colorimeter is producing better results. NEC and others recommend a custom mated colorimeter with filter matrices which should take care of both issues. We’ve seen this advise over the years in terms of mated colorimeter’s dating back to Barco and Pressview days.
>
> My original point was, Edmund’s claim about the Spectrophotometer was simplistic and thanks to Marco’s suggestions, we see that is indeed true and why.
>
>> ...in fact most of its discussion refers to laboratory
>> grade spectrometers and colorimeters, not the sort of instruments
>> available to most people.
>
> I believe that Karl is using this as a “gold standard” in terms of comparing the accuracy of the consumer devices. In other words, your mileage may vary considering the article doesn’t specifically discuss any product by name.
>
> If someone has or will produce a review of a larger sampling of devices that are undefined by Edmund’s post, doing so in an unbiased and scientific (consumer reports like fashion), that would be indeed a good read.
>
>> (ever pulled the diffuser
>> off a Spyder ? it's got basically the same Light to Frequency sensors that
>> all the other cheap colorimeters use), and it is easy enough to
>> increase spectrometer integration time to match or indeed surpass
>> the repeatability of any such colorimeter.
>
> Again, such a review using a specific product would be an interesting read.
>
> Edmund’s post was as general and non specific as one could imagine, Karl’s is far less so but I don’t see Karl suggesting that all Colorimeters, (one could include a huey) are superior to all Spectrophotometer’s or vise versus. At least we are drilling down to more specifics. The idea that “an i1 Pro Spectrophotometer is more expensive so its better” doesn’t really wash. That was my original point.
>
> Andrew Rodney
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