Lightroom Classic 9.0: Strange behavior with develop history

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  • Updated 8 months ago
  • (Edited)
Today I realized the following strange behavior when using the develop history. I am not sure if that's new in Lightroom 9.0, or if it was also there in older versions.

I have photo with some develop settings I did in the past.
The develop history panel looks like that


The slider in the develop panel are looking like that (note I have selected the "Auto Settings" entry in the history panel.


When I now select the "Black Clipping" entry in the develop history I expect that only the "Blacks" level slider changes (to -16 as -29 + 13 = -16)
However the develop panel now looks like that. The values of almost all sliders have changed, not only the Blacks level.


Can anyone else reproduce this behavior
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Thomas Egi

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Posted 8 months ago

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Robert Somrak, Champion

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Works fine for me on Lr9.0 and macOS 10.14.6

Upload the file with the XMP sidecar or a DNG for us to test
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Anthony Blackett

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I don't see thing happening either- Windows 10 Pro 64 v1903
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Thomas Egi

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Hello and thanks for your replies.

Maybe my description was not clear enough.
I have the feeling that the described behavior was introduced with the catalog upgrade which happened when when I upgraded Lightroom from 8.4 to 9.0.
I do not have an older Lightroom version available, so I cannot test this.

What I describe above only happens with photos with develop settings applied in pre 9.0 versions of Lightroom, and which have "Auto Settings" applied and then in addition some additional individual correction on top of the "Auto Settings"
What's most irritating is the fact that most slider values change when I go up in the develop history (to "Black Clipping" in the image above) and not just the value for Black Clipping.

Can you please test that again in your environment, and if there is anyone with an older version of Lightroom (8.x), can you please test that also on this older version

Thanks
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Anthony Blackett

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Yes Thomas, I can now reproduce what you have descibed.
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Robert Somrak, Champion

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I may be because the AUTO in history is using an "older" version of the Auto algorithm because it is from an older edit.  The Auto algorithm has been "Improved" a few times in different Lightroom versions and maybe by stepping back in history and deselecting Auto and then reselecting Auto then instead of using the "older" algorithm settings it is updating to the "newer" algorithm.   

This is just a guess as I have no photo to experiment on.
 
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Anthony Blackett

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I would say that you are right on the money there Robert.

I just tried Auto with Lr Classic 8.4 and with 9.0 using the same raw image (a 5-stop under exposed image I used for another test). Here is a screen shot from Lr Classic 8.4



Here is the same image with Auto applied in Lr Classic 9.0



You can see that the Tone settings are quite different except for Contrast. My Lr 8.4 is on a different computer to my Lr 9, but I don't think that would matter in this case. I also think the Auto algorithm must be changing slightly with each update. It does indicate a minor issue in that the change value in the History can't really be relied on to be accurate. What really matters is the final adjustment value is correct even though the arithmetic in getting there appears to be wrong.

We shouldn't have to speculate about things like this. Adobe should respond and give an explanation.

Tony