Lightroom Classic CC: Failure to fix bug with Local Adjustment tools not updating histogram as sliders are moved

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  • Updated 3 months ago
  • (Edited)
In Lightroom Classic CC, as sliders are adjusted in any of the local adjustment tools (graduated filter, radial filter and adjustment brush), the histogram still does not change as the sliders are moved, but only changes when the slider is released, except - see below. This problem has been reported before on this forum and has been around at least since Version 4, yet it has been totally ignored by the development team.

The problem is even worse if the slider is moved fully to the left or right. In that case, the histogram does not change at all! Not even when you release the slider. Not even if you close the local adjustment tool. Only when you make another adjustment does the histogram change to reflect the full extent adjustment made in the local adjustment tool.

Try it for yourself - edit an image in the develop module. Add a radial filter that covers around 50% of the image. Now push the Exposure slider all the way to the right and watch the histogram. Nothing, doesn't change, even though you have just blown your image off the scale. Close the radial filter tool and the histogram still doesn't change.

This is just one example of a little annoying bug that Adobe has not bothered to fix, even though it has been reported a year ago.

How difficult can this possibly be to fix? Action on this should have been taken along ago.
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Anthony Blackett

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Posted 9 months ago

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Arjun Haarith, Employee

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Hi Anthony,

Few clarifications required :
Close the radial filter tool and the histogram still doesn't change.
We are not able to reproduce this issue. I have made a video recording (https://adobe.ly/2h37Lol) of the behaviour that I am seeing.
Could you please let me know if this what you were expecting?

Also,

1) What kind of image was the issue observed on?
2) Is this happening all the time, or only on specific image/image types ?
3) Are there lot of edits for the image in question ?
4) Does the issue resolve after restarting Lightroom ?
5) What behaviour do you see when the GPU acceleration is checked (Preferences -> Performance -> Use Graphics processor) ?

Thanks,
Arjun
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Anthony Blackett

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Thank you Arjun for your reply.

Your video shows part of the problem I reported. When you slide the exposure up, there is no change in the histogram, nor does there appear to be a change in the image itself! Nothing changes when you release the slider either! It does change when you close the radial filter, which is different to the behaviour I see.

You have the mask turned on. Turn it off, then you will see the behaviour that I see.

I'm using a Toshiba laptop with Windows 7 Pro 64bit.

  1. I observe this with raw images (NEF) - only shoot raw.
  2. Happens all the time.
  3. There can be no edits or many edits, doesn't matter.
  4. Restarting Lightroom changes nothing.
  5. Turning on or off GPU acceleration makes no difference.
Graphics Driver Info:

Graphics Processor Info:
OpenGL: GeForce GT 525M/PCIe/SSE2

Check OpenGL support: Passed
Vendor: NVIDIA Corporation
Version: 3.3.0 NVIDIA 388.00
Renderer: GeForce GT 525M/PCIe/SSE2
LanguageVersion: 3.30 NVIDIA via Cg compiler
Total Video Memory: 2048 MB
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Arjun Haarith, Employee

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Thanks for the information Anthony.
We will look into it.

Thanks,
Arjun
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Jerry Syder

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@Arjun I can confirm this inconsistency. Sometimes it works as per your video, sometimes it works as per Anthony's suggestion where you see no change in the histogram even after coming out of the radial filter. Even when I delete the radial filter(with a drastic change to it), there's no change to the histogram. I can confirm this with the graduated filter too, as well as the brush. Watch Video Here 
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Arjun Haarith, Employee

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Thanks for trying out and confirming Jerry.
We are looking into it.

Thanks,
Arjun
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Anthony Blackett

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Arjun, please don't overlook the fact that the histogram doesn't follow the adjustment sliders in the local adjustment tools until the slider is released. This is important since we need to know how our adjustments are affecting tones in the image as the sliders are moved, not when we have released it. The basic panel works this way, so should local adjustment tools.
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Arjun Haarith, Employee

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Hi Anthony ,

Thanks for the inputs. I am also able to replicate what you are seeing.
However, when the edits are incremental, the histogram changes instantly. But if there is a drastic change, then it is not able to redraw the histogram to suit that particular value.
The second video in my recording shows this behaviour (https://adobe.ly/2h37Lol)
We are looking into this. 
Thanks for reporting.

Thanks,
Arjun
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Anthony Blackett

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I'm still not sure that you are understanding what this problem is. Yes, the histogram does update if you click/hold and move a slider, then release the mouse button, so long as it is not released at the extreme left or right. But, the issue is the histogram doesn't update as you click/hold and slide the adjustment back and forth. So you can't see the histogram result until you release the mouse button.
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Arjun Haarith, Employee

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Yes that's true. This is what even I have observed.
We will provide a fix to this in a future update.

Thanks,
Arjun
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Anthony Blackett

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Here we are again. Six months on and still this obvious bug is not fixed despite the assurance that it will be fixed in a future release. The future is a very vague time frame. How about fixing it now! We are in the future right now.

This bug was reported two years ago. How long do we have to wait?
(Edited)