Definitely a colorimeter is most useful, when compared with a spectral devise
in regard to their substantially higher s/n ratio. Due to the far greater
surface area of the photodiodes typically used in colorimeters, this is what
makes them so much more sensitive to low luminescence while measuring far less
noise than most, if not all, spectrometers that commonly cost an order of
magnitude more than the colorimeter.
Not to mention the time taken to perform the measurements is much less when
using a colorimeter than a spectrometer.
I’ve an i1pro, an i1pro2 and an i1DisplayPro and I see very little, if any
benefits to using either of the spectros to perform screen measurements. The
profiles don’t seem to suffer in any way and neither does the general accuracy
of measurements performed by the colorimeter seem to be any less valid than
those performed by either spectro.
I’ve read that colorimeters such as something like a Klein K10-A, with
according to their website is sold for US$6,900 will generally be the
equivalent in terms of accuracy to a laboratory grade spectroradiometer costing
upwards of US$30,000-$40,000+(!!). If memory serves, Karl Lang, designer of the
Sony Artisan CRT monitors made just such a statement (apart from mentioning any
brands, I did that purely as an example) in an article he wrote about the
benefits of using colorimeters for performing emissive measurements as opposed
to using a spectoradiometric type of device.
And without doubt, for those of us normal people, who can’t afford to be
spending several thousands of dollars on a colorimeter, and as much or more on
a spectrometer also, there’s very little detriment in using either a
colorimeter alone or together with a consumer grade spectrometer (such as one
from the i1 family) to create a CCMX file to help improve the accuracy of the
colorimeter.
Sent from my iPhone
On 15 Jun 2021, at 5:31 am, graxx@xxxxxxxxxxxx wrote:
Ben,
If I’m using an i1proX “class” instrument then, you say it might not be a
luxury to dispense of spectral data all together? And only feed in XYZ in the
ti3 file?
Sorry to bring back the age-old question, what kind of “stimulus” colors
exactly benefit from measuring with a (filter-based) colorimeter such as
i1Display (old DTP94, Spyders…) rather than with a (holographic-based)
spectrometer instrument? Extremely saturated colors, such as the “pure
primaries” or the “low Luminance” colors such as below 5 Cd/m2?
Never mind the relative accuracies of each instruments.
/ Roger
From: argyllcms-bounce@xxxxxxxxxxxxx <argyllcms-bounce@xxxxxxxxxxxxx> On
Behalf Of Ben Goren
Sent: Monday, June 14, 2021 2:12 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: Spectral data for building Monitor profiles
On Jun 14, 2021, at 11:02 AM, graxx@xxxxxxxxxxxx wrote:
Are there any advantages to having spectral data for building monitor
profiles with argyll? (Or with any profiler in general, I suppose)
Suppose I try to make my life simpler? And I have a choice of including both
XYZ and spectral data from my instrument into the ti3 file? Am I getting
“better”, lower DeltaE, better 3D “fit”, in having spectral data in then ti3?
If, in addition to your spectrometer, you also have a colorimeter, “best”
would be to create a CCMX.
The documentation gives all the details, but the basic idea is that you
measure the primaries with both instruments. Argyll then does some math to
figure out the interplay of the colorimeter’s primaries and the display’s
primaries; that’s what the CCMX records. Then, you build the profile with a
full set of measurements from just the colorimeter “filtered” through the
CCMX.
Colorimeters are almost universally more sensitive in low emissive
environments and faster in general than spectrometers. Measuring the display
with the colorimeter lets you get better measurements of the near-blacks, and
you can get more measurements in the same amount of time. Thanks to the CCMX,
there’s no loss of spectral fidelity.
If you don’t have a colorimeter…I don’t think the spectral data is going to
do much to improve things. It won’t hurt, and it might be a fun thing to
experiment with. But it’d be pretty far down on my own personal list of
priorities.
b&
