Re: Two monitors, side by side
Re: Two monitors, side by side
- Subject: Re: Two monitors, side by side
- From: John Castronovo via colorsync-users <email@hidden>
- Date: Wed, 5 Feb 2020 15:30:49 -0500
- Importance: Normal
Oldest Star Trek date mentioned in the series is 2151
-----Original Message-----
From: Roger Breton via colorsync-users
Sent: Wednesday, February 05, 2020 2:16 PM
To: ''colorsync-users?lists.apple.com' List'
Subject: RE: Two monitors, side by side
Wayne,
I agree moving to "laser" (narrow wavelength LED diodes a.k.a. SAMSUNG
Quantum Dots?) is going to exacerbate individual observer differences. I
remember reading this discussion on the list a while ago.
Question: so, colorimeter see the monitors as "identical" because their
respective spectra produce the same "signal" to the brain, in terms of
"sensation". I don't suppose spectral measurements of their respective white
points could not be used in some sort of advanced spectral matching
computation? Hey! We're in 2020 😊 ... Isn't that the year of Star Trek?
/ Roger
-----Original Message-----
From: Wayne Bretl <email@hidden>
Sent: Wednesday, February 5, 2020 2:10 PM
To: email@hidden; ''colorsync-users?lists.apple.com' List'
<email@hidden>
Subject: RE: Two monitors, side by side
Well maybe...
Part of the problem is the small population that has been used for
determining the standard observer - the evidence of variability is plain,
but it's more difficult to determine the reliability of the average. Plus I
believe later research has shown some flaws in the standard observer (but, I
believe, smaller than the variation). I haven't take a deep dive into the
topic of new data, since the 1931 basis continues to be used and the
personal variations (observer metamerism) are relatively large.
By the way, individual variations are becoming more of a concern to the
movie industry as they move to laser projectors.
-----Original Message-----
From: colorsync-users
<colorsync-users-bounces+waynebretl=email@hidden> On Behalf Of
Roger Breton via colorsync-users
Sent: Wednesday, February 05, 2020 11:59 AM
To: ''colorsync-users?lists.apple.com' List'
<email@hidden>
Subject: RE: Two monitors, side by side
Wayne,
Part of you reply would attribute the visual difference to my deviating from
the Standard Observer? This would imply that, given a relatively large
number of people seeing the difference in the two display white points, "on
average", the consensus is that "they would match"?
I confess I have no idea to what extent my color vision deviates from the
1931/2 color matching functions ☹
/ Roger
-----Original Message-----
From: Wayne Bretl <email@hidden>
Sent: Wednesday, February 5, 2020 1:55 PM
To: email@hidden; ''colorsync-users?lists.apple.com' List'
<email@hidden>
Subject: RE: Two monitors, side by side
Charles J. Hirsch of RCA, in November 1964, published a paper in the IEEE
Transactions on Broadcast and Television Receivers, "A study of the need for
color controls on color TV receivers in a color TV system operating
perfectly."
In this paper he analyzed the effects of differences in spectral response
among individual observers with normal color discrimination, as recorded by
Gibson and Tyndall in 1923-24. Hirsch's conclusion was that with NTSC
primaries (similar to Adobe RGB), adjustments of +/- 20% or more in the
proportions of a mixture might be required to nullify the extremes of
observer differences.
In other words, do not expect that you are a match to the standard observer,
and expect to see some difference between displays that have different
spectra.
I, too, have two disparate monitors, and they do not match exactly to my eye
when the i1pro says they should. I use the larger, wider gamut one for
judging images and the smaller one for menus.
I also note that the mismatch when first turned on is much greater than
after 30 minutes of warmup. I suspect this is due to change in the color of
the fluorescent backlight as the internal pressure stabilizes.
-----Original Message-----
From: colorsync-users
<colorsync-users-bounces+waynebretl=email@hidden> On Behalf Of
Roger Breton via colorsync-users
Sent: Wednesday, February 05, 2020 10:21 AM
To: email@hidden
Subject: Two monitors, side by side
I managed to pull my old CG-21 of the moth balls, to serve as a second
display - how could have I ever lived without this convenience? Crazy.
Of course, first thing I did was to try to make it "look" like my NEC
PA271W. They're both LCD monitors yet, at the same chromaticity and
Luminance, they don't look the "same". One is "reddish" (CG-21) while the
other (NEC) is "greenish".
Any suggestions?
/ Roger
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