P: Brighten the Histogram as LrC 13.0 histogram is much darker than LrC 12.5

> So this is not about how the histogram functions but it's about how the results are displayed.

Both - how results are displayed affects the functionality. How it functions under the hood is irrelevant since photographers don't know/don't care about that.

I see two problems with the v13 histogram display:

1. it is generally much darker (which is a design problem)

2. the "thin line" that is always extending all the way to pure black and pure white (which is, I'd say, a bug)

The 2nd can be reproduced by applying extreme settings. This depends on the photo but it could be something like this. First, no thin line:

Then I adjusted the Blacks just a tiny bit — and the thin line shoots all the way to the Whites in the Histogram, but needless to say, there are absolutely no tones in the actual image at this point that would reflect this.

Cheers

Alex.

So this is not about how the histogram functions but it's about how the results are displayed.

Does anyone have a link for an Adobe document addressing the new histogram? The why, the how.

All I can find are third party documents (well, Ok, one document) on how this is a big mistake. ( and Adobe, a mistake in design, IS a bug)

https://www.alex-kunz.com/new-features-in-lightroom-classic-13/

So looking at this histogram for example (it should be the size corresponding what I see on 14" laptop) please tell me whether the image is underexposed or not.

> I am not sure if I what the problem is?

Seriously? You showing screenshots with exposure where white/black point set already with lots of data in hightlight and blacks to allow ends of the histogram to look distinguishable. Look at screenshots I gave - all those at least 1 stop underexposed. Or in your case move white point/exposure to be under exposed to see the difference between 12 and 13.

I just happened to edit a few shots after update with highlight area being not so greatly represented so on a new histogram you cannot see where empty area ends and those highlights and histogram actually begins and I spent ages tweaking what used to be 1-2 seconds job.

My experience, 

I am not sure if I what the problem is?

See the screen captures.

The first image is a screenshot from my iMac running Big Sur and Lightroom Classic 12.5.

The second is a snip from my Win 11 laptop and Lightroom Classic 13.0.1.

OK I think I get it now, you are referring to how the edges are highlighted?

Totally agree. I just upgraded and as soon as I saw the histogram, I thought something had gone wrong with the install. It's unreadable and I want the old one back.

Yeah, I don't think they wanted it to be unusable. It can be difficult to design things for different people who have different needs and different ways of using things. Even here, we both prefer the old version. Whereas you consider it unusable, I merely don't like how it looks. Same conclusion, but very different levels of frustration.

I definitely see what you're saying about the line at zero; it just doesn't bother me. It isn't a big enough of a difference to affect my workflow. If I have to strain my eyes to see if the number of pixels at a given brightness level is zero or non-zero, then to me it's not a big enough area to be too concerned about. But I can understand if that level of finesse is important to other people. I definitely have areas where pixel-level specifications can be infuriating.