LR12 Crushing shadows in develop modul

[tom24]

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Hello

I am on Mac OS Monteray 12.6.1. - MacBook pro 16 (2019 - NO M1)
I use the latest version of Lightroom and ACR.

Has anyone noticed a slight difference between viewing in the Library and the Develop module that wasn't there before?

It can be seen very clearly at 100% preview.

Observed on mine and my wife's MacbookPro (on two MacBooks).

Thanks

[Alberti]

Can you expand on this?

[tom24]

that's exactly how I see it:

https://community.adobe.com/t5/lightroom-classic-discussions/lrc-12-0-crushing-shadow-detail-in-develop-module/m-p/13338643 

[Alberti]

Thanks for the hint. I will check later the coming days. 

[I did see such a difference in the past, though did not experiment/test, I think it was on my Retina 21.5 inch machine.] I do not think it is moot.

The way I saw it was that the colour is affected (toenails), which is obvious because that is dependent on the amount of light in the relevant curve/shadow areas.

[Alberti]

OK. I did a check. With a M9 Monochrom file.

I loaded it in the library mode + F = full screen. This amounts to 100%

Then I pushed D for develop mode, where I had it in 100%. I saw the shadows darken themselves just a slight amount. QED?

But I also saw that some datils are rendered better in the D-mode. It is as if the Library mode makes use of a different preview screen emulation. For some pictures this image would not be sharpened, so I have to refresh it myself even in library mode (= press G,F) (Ah software ..).

But with an M10R file I see no difference. 

All this is very unscientific. 

So I went into the toolbox. The digital colour meter Apple has.

• Took the same spot. M9M image. A grey wall, two pixels below a recognition point. In library and in Develop mode. Same magnification.
• Lo and behold: all three colours RGB were 177/177/177 (some grey) on both images - in G and D mode.
• I took a colour image. Both were 0/70/159 (blue) on the same spot; so no difference either.

Hardware: Studio, LG monitor, hardware acceleration is on (and it is displayed in sub seconds I can tell you - LR cache and LR previews are read from the main drive 😎)

I ponder a bit. The problem is: what is right? What is the norm? If one random point is the same then all are . . . ? 
——

an added remark: with the Retina screen I never saw that the monochrome was exact grey in the colorimeter. There was always a deviation. So that screen was not perfect. the LG is …

Edited December 19, 2022 by Alberti