Use simulation profile as display profile in verification

[LongDoan]

Hi everyone, I’m aware that there have been a few topics asking this question, however I find it a bit confusing (for me and my case) so I have to ask this question yet again.
What i’m using:
EIZO cs2400s
Davinci Resolve and Photoshop
No decklink
Calibrated with CN7 and verifying in DisplayCal
Windows 10
If I understand it correctly, the option to use simulation profile as display profile means comparing the unaffected by any profile state of the monitor to the simulation profile, and can be used to verify HW calibration.
On the other hand, not choosing this means I’m verifying my CN7 generated icc profile against the simulation profile.
To my knowledge, EIZO monitors on the CS line can only hold 3 1D LUTs internally as a form of HW calibration, and has an icc that its only job is to describe the state of the monitor to proper color managed softwares like Photoshop.
So here’re my questions.
– In that case, I should use simulation profile as display profile when I verify my calibration, otherwise I’m comparing a null profile to a simulation profile, correct? I tested both options and in the reports, the one with the option unticked shows wild number of deltaE for colors, but gray scale and white balance is mostly the same reading in both.
– I opened a color chart in Photoshop and Davinci Resolve with clean feed mode (no decklink) and they seem visually match, does that mean I have somehow successfully eliminated OS interference even without the decklink card?

Thank you for your patience

[Vincent]

All coloredges use 1D LUTs (degamma/gamma), a 3×3 matrix for channel mixing (gamut simulation, native gamut = identty matrix). CG-X have an additional 17^3 LUT3D in the middle of the pipeline.

So on any HW calibration & profilling done by CN7:
-no simulation profile = verify if CN7 calibration matches ICC profile generated by CN7. This mean’s “display PASS for color managed apps”
-simulation profile “A” but NOT choose “use simulation profile as display profile”. This is color managed simulation for colorspace “A”. For example, if you simulate AdobeRGB on an sRGB display it will test how accurate Photoshop can be. It will show low dE for AdobeRGB colors inside that sRGB display and higher for out of gamut.
-simulation profile “A” and choose “use simulation profile as display profile”. This will test if display as is, WITHOUT VCGT GPU calibration (it does not matter for yur coloredge, but for other monitors you’ll have to keep this in mind) behaves as colorspace “A”.

Thus
-question1: to test CN7 calibration for general use, run verification option 1.
-question2: if you calibrate with CN7 to Rec709 gamma 2.4, D65, 100nit (an example) and you want to test how it will look as reference rec709 vidoe display without color management (no “use mac profiles” in Resolve, No LUT3D at all), use option 3 in displayCAL, simulating Rec709 gamma 2.4

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