Participant

P: LrC 15.4 Persistent RGB/LAB readouts in Histogram not working in Develop

Forum|Forum|6 days ago
June 30, 2026
4 replies
120 views

This is core to my workflow, an absolutely necessary feature I use every single time I’m editing photos.

In the Develop Module, under let’s say the “Basic” adjustments panel, one should be able to adjust values (such as Exposure, Contrast, Highlights, Shadows, Whites, Blacks, etc.) while hovering the mouse cursor over a section of the photo (in the Loupe View) and see RGB values changing under the histogram.

In the latest version, the RGB values are no longer displayed under the histogram while those values are being adjusted. For example, I click the number next to the ‘Highlights’ slider and move my cursor over to a white part of the image. When I press the up arrow on my keyboard to increase the value of that number, the RGB values under the histogram *should* be displayed and also increasing. Instead, they are not displayed at all.

I have downgraded to the previous version and the program’s behavior returns to expected.

This is a brand new computer, fresh win 11, AMD Ryzen 7 7700X; 32GB RAM; NVIDIA GeForce RTX 5060Ti (16GB)

*I already opened a support ticket for this which was closed after the agent never got back to me - this is the place the second support agent sent me to submit a bug report.

**And to be clear, this happens under other adjustment panels (Tone Curve, Color Grading) as well.

M

MSpears

Participant

I immediately noticed the same issue. I use a TourBox Console controller to adjust the RGB channels of dark space backgrounds and white highlight areas of astrophotography images while using the mouse to point to different sample points. Shouldn’t have to jump to Photoshop to do this.

M

MSpears

Participant

It was working on the previous Lighroom Classic version. It stopped working when I installed the latest update on on July 4th, 2026. Here is what I am seeing. From the Develop module… Tone Curve. Select a RGB channel curve. Select a control point control (example the black end). Now, click on an Input or Output value box so that it shows an edit change mode. With the mouse, hover over sample area of the image. Using the arrow up or down keys to increase or decrease the value while monitoring the RGB histogram values. I repeat this for each RGB channel.

The new update causes the values on the histogram to now appear as dashes (no values) when you select the Input or Output value box for editing.

Attached files: Adobe Lightroom RGB..jpg is what it looked like before the update.

Adobe Lightroom RGB2.jpg is what i now see with the latest update.

J

johnt41947401

Inspiring

I’m very surprised so few people have commented on this issue which is very visible. Hopefully Adobe issue an update to address this in the near future.

J

johnt41947401

Inspiring

Sameer,

Thanks for your reply, I’ve attached a video demonstrating the RGB/ LAB values disappearing after opening any dialog box, hopefully it provides the information needed to resolve this very annoying issue! As mentioned previously, this is not an issue in ACR and it started with the release of LRC 15.4. You’ll see I’m not alone in having this issue either!

Before and after adjustments is very intermittent so I’ll monitor it and if I get repeatability I’ll screenshot or video it for you?

NAS activity at start up; I optimise the catalog every time I exit LRC so its not that and my previews are stored locally on an SSD along with the catalog. I’ve noticed no fall in duration of NAS activity and I installed the update some 10 days ago and use LRC every day so I’d have thought all updating was long finished for what is a small catalog with a 2.5GB LAN connection?

Thanks

John

J

johnt41947401

Inspiring

Video didn’t attach previously!

J

johnt41947401

Inspiring

I raised a question on exactly the same issue at pretty much the same time you did and I’m in complete agreement as like you I find it very annoying and its not in ACR. Its just LR.

D Fosse

Community Expert

You should post this in the Lightroom Classic forum. This is Photoshop.

FWIW I’m not having this issue - and yes, this is something I constantly rely on when working in Lightroom Classic. Except for i7 11700 CPU, my hardware is pretty similar to yours, also RTX 5060 Ti.

You’ll be asked for the full Help > System Info, so include that.

C

charlielovesyouAuthor

Participant

Ok thank you, will do

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