Inspiring

Question

2 up vertical duplicate image colour shift (bug?)

Forum|Forum|3 years ago
December 19, 2022
5 replies
3019 views

I am trying to resolve an issue. I am seeing a color/ luminance shift when viewing two identical images created with image>duplicate in two up vertical view. (see screenshot attached)

Is this a known issue?

PS V 24.1.0

OSX 12.6.2

M1 Max processor (macbook pro 16")

Eizo CG279X monitor

Custom color profile 90cd,0.4cd, 6800k, 2.2 (v4 profile)

macOS

This topic has been closed for replies.

Gibson EditionsAuthor

Inspiring

Basically any image i take and duplicate and view side by side shows a difference. Can anyone else repicate this on their setup.

Currently i have been able to replicate the issue on a M1 mac with CG279X and Intel Mac pro 6.1 with CG277 both running PS24.1

TheDigitalDog

Inspiring

Basically any image i take and duplicate and view side by side shows a difference. Can anyone else repicate this on their setup.

Currently i have been able to replicate the issue on a M1 mac with CG279X and Intel Mac pro 6.1 with CG277 both running PS24.1

By @Gibson Editions

I cannot. I'm using an NEC SpectraView PA271Q. M1 Mac, 24.1 version of Photoshop, the latest version of macOS.

FWIW, I'm using a much, much better test image to compare:

http://www.digitaldog.net/files/Gamut_Test_File_Flat.tif

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Gibson EditionsAuthor

Inspiring

Many Thanks for having a look, I really appreciate it. I will use your test image for comparision in future.

TheDigitalDog

Inspiring

V4 profiles bring nothing to the party! I know of no software creating them that supports the PRMG. Just select V2, your life will be easier 😋

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

Gibson EditionsAuthor

Inspiring

and what about LUT vs Gamma EOTF ?

TheDigitalDog

Inspiring

and what about LUT vs Gamma EOTF ?

By @Gibson Editions

YMMY, depending on software (making and using) LUTs.

Mine are in the panel; better.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"

D Fosse

Community Expert

There is no difference. Here's an overlay with zebra-striped mask:

Gibson EditionsAuthor

Inspiring

Many thanks for checking, In theory they are identical

Gibson EditionsAuthor

Inspiring

Many Thanks i will try this. However surely, LUT based profiles should be theoretically more accurate than Matrix based ?

see attached a 100% view. To my eye the left hand side is reading cooler and darker/ slightly more contrast than the right. I am talking very subtly. Probably not viewable in difference unless applified

Gibson EditionsAuthor

Inspiring

So ive just had a colleague using the same test image duplicated and displayed 2 up vertical. this time on a different machine (Mac pro 6.1) with a different Eizo CG277 and same calibration target and they are seeing the same shifts that i am on screen.

"left hand side is reading cooler and darker/ slightly more contrast than the right."

Any ideas Adobe?

Gibson EditionsAuthor

Inspiring

Thanks Michael, I was thinking this too. However, My colleague has performed the same test on a different machine, in a completely environment (different building). Which makes me believe this is software bug, The cooler representation is always on the left. I can even see the difference using a blank white canvas

I've just performed the following test. I made a blank document White background, and duplicated it then arranged them 2 up vertical.

I then measured the two sides with i1pro2 and see the results. This is for sure a bug

D Fosse

Community Expert

When I overlay these two and flip between them, I am absolutely unable to discern any difference whatsoever. Difference blend mode is pitch black until finally with a maximum curve you get a very faint uniform noise, probably because the screenshot isn't at 100%. Using an Eizo CG2730.

Generally, v4 is slightly risky, but LUT-based profiles can be problematic even in Photoshop. Both are defaults in ColorNavigator. Matrix profiles (called gamma (eotf) value in CN) are much safer and much more reliable, and I would recommend you change this in Preferences.

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