P: Histogram behaviors are different from prior versions

@Nikunj_Muglani

Nikunji, I am so grateful to you and the team at Adobe for addressing this issue. I have downloaded 22.4 for Mac and delighted to report that the histograms are working properly once again. It has already contributed positively to my image-making, and I feel once again that I have the full benefits of PhotoShop.

Similarly, the intercept line in the Curves function is always working great.

However, I must sadly report a bug. When the Curves function is up and running, and I got to refresh the histogram while experimenting with the Curve, it will not update properly. I have to press the refresh button on the histogram as many as a dozen times before the histogram will finish and display. This did not occur previously, so I would assume that the 22.4 update of the histogram function has fixes the data tails issue, but introduced a new bug. My apologies.

Never the less, I am delighted that the tails in the histogram data now show properly. It is a great relief! My sincere thanks.

Pete Myers

Santa Fe

PS update 22.4 appears to have fixed the Histogram issue discussed here, but appears to have introduced another issue. With grayscale images the Curves panel is now reversed from 0-100 to 100-0 as shown below. RGB images are correct and show L to R as 0-100.

I may have some other issue on my system so would someone else please verify on their system. I'm on Windows 10.

Oh, and I should have added---the Levels Adjustment function histogram needs to be fixed too.

Hi Jeffrey:

Thanks for checking in.

Yes, both the histogram issues and separately, the interception line in Curves issue are unresolved. Again, I am on 22.0.1. I did not see any bug fix notes to indicate that either of these issues was addressed in 22.1. Do I need to upgrade to check?

It seems from your note that the interception line issue is in engineering to be resolved---which is GREAT! Bravo. Really appreciate it.

But how do we get the histogram issue fixed? There is an obvious difference in the histogram used in Curves or in RGB COLORS histogram, then in a channel or in monochrome. The former being correct, the later not.

Pete

The intersection line issue is still open/being worked on: https://feedback.photoshop.com/conversations/photoshop/photoshop-intersection-line-in-curves-not-working/5f5f46204b561a3d4274eec6 

I see that engineering made some changes to try and address this in 22.0.1 or later. Are you still seeing a problem?

I see that https://feedback.photoshop.com/conversations/photoshop/photoshop-191-histogram-behaviors-are-different-from-prior-versions/5f5f45df4b561a3d4264480a?page=2 was addressed by engineering in 22.0.1 or later. Are you still seeing a problem?

And just to understand, the tails in the histogram data are a logical OR function. If there is even one pixel in an entire image at a given level, there should be an indication of that on the base-line of the histogram. That is how the histogram has worked the entire life of PhotoShop until recent versions.

As it is now, some one has decided that if that single pixel is outside the statistical relevance of the histogram data, then it will not show. The problem with this logic is that there can be long tails hidden that when ignored representing significant amounts of energy in the photo, resulting in either white or black clipping and holes in the photo.

Examples: let us start out with a 6Kx4K monochrome file, 16-bits that has significant data tails, then construct and RGB file by pasting the monochrome file into each channel.

First, let us try a Curves Function of this file. Please note two issues; first, the Intersection Line is not showing despite it having been selected. Second, carefully note the extended tails of the histogram data (which is correct here, not in the histograms).

Now, let us try using the Levels Control. Please note how the tails of the histogram data have disappeared.

OK, so now let us select only the Green Channel from the same RGB file (remember, all channels have exactly the same monochrome image). As can be seen, the tails of the data have once again disappeared. Poof! Gone!

The final example is just doing a straight-up histogram on the monochrome base image that was used to construct the RGB file. What it shows is that the monochrome histogram does NOT display the tails. Since most of my work is monochrome, this is the histogram that is most important to my work. I used the RGB examples above for the reason that most people work in RGB, and the COLORS setting does work properly, while the rest not.

The last time all of the histograms worked properly with the functions was in 2015.5. I have shared this information repeatedly with Adobe over multiple versions of PS, and it has not been resolved.

Please Adobe, these are fundamental tools in PhotoShop. For advanced users, these are the essence of our work. The interception line and histogram issues need to be resolved!