RE: Two monitors, side by side
RE: Two monitors, side by side
- Subject: RE: Two monitors, side by side
- From: Wayne Bretl via colorsync-users <email@hidden>
- Date: Wed, 5 Feb 2020 12:10:17 -0700
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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