P: Develop Auto produces incorrect histograms

2 Votes
LEGEND ,
Jun 06, 2019 Jun 06, 2019

Copy link to clipboard

Copied

Develop Auto can produce noticeably incorrect histograms. To reproduce:

1. Import this raw file.

2. In Develop, click Auto. Observe this histogram:



3. Go to Library, then back to Develop on the same photo.

4. Observe this histogram, which differs a fair bit in the highlights:



Tested on LR 8.3.1 / Mac OS 10.14.5.

----------------------------------

The bug's cause: Auto doesn't set the following Develop settings, which are normally present in Process Version 5 photos:

Brightness = 50
Contrast = 25
Exposure = 0
Shadows = 5

Even though these settings are for Process Versions 1 and 2 and don't normally affect Process Version 5, somehow their absence is tripping up the histogram.

To prove this, insert these steps:

2b. Use  the Show Catalog Metadata plugin to examine the develop settings -- those  four settings are all nil.

3b. Use the plugin to examine the settings again, and notice those settings are now present with their default values.

4b. Use an SDK debugger to remove those settings from the photo, and notice the histogram changes immediately back to that from step 2:

s = targetPhoto:getDevelopSettings ()
s.Brightness, s.Contrast, s.Exposure, s.Shadows = nil, nil, nil, nil
catalog:withWriteAccessDo ("", 
    function () targetPhoto:applyDevelopSettings (s) end)



Bug Fixed
TOPICS
macOS , Windows

Views

39

Translate

Translate

Report

Report
Community guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
community guidelines
7 Comments
LEGEND ,
Jun 06, 2019 Jun 06, 2019

Copy link to clipboard

Copied

Votes

Translate

Translate

Report

Report
Adobe Employee ,
Jun 06, 2019 Jun 06, 2019

Copy link to clipboard

Copied

Hi John,

Thanks for reporting this issue. I am able to reproduce it and have filed a bug for this.

Also the Histogram reverts to step 2 when you edit any settings after applying Auto. So it might not be specifically elated to the four settings you mentioned. In any case, we will investigate the issue.

Thanks,
Chinoy

Votes

Translate

Translate

Report

Report
Adobe Community Professional ,
Jun 07, 2019 Jun 07, 2019

Copy link to clipboard

Copied

I can confirm this issue as well. It may be related to this other report John posted.

https://feedback.photoshop.com/photoshop_family/topics/lightroom-different-histograms-for-identical-...

Votes

Translate

Translate

Report

Report
LEGEND ,
Jun 07, 2019 Jun 07, 2019

Copy link to clipboard

Copied

"Also the Histogram reverts to step 2 when you edit any settings after applying Auto. So it might not be specifically elated to the four settings you mentioned."

Agreed.

Votes

Translate

Translate

Report

Report
Adobe Employee ,
Jun 16, 2020 Jun 16, 2020

Copy link to clipboard

Copied

Version 9.3, an update to Lightroom Classic, went live on June 15, 2020 and contains a fix for this issue. Please install the update and respond back if it does not cure the issue for you. Thank you for your patience!
Rikk Flohr - Customer Advocacy: Adobe Photography Products

Votes

Translate

Translate

Report

Report
LEGEND ,
Jun 16, 2020 Jun 16, 2020

Copy link to clipboard

Copied

I tested the bug recipe in the first post and it no longer shows the bug, thanks.  LR 9.3 / Mac OS 10.15.5.

Votes

Translate

Translate

Report

Report
Adobe Community Professional ,
Jun 17, 2020 Jun 17, 2020

Copy link to clipboard

Copied

LATEST
The Auto Tone histogram bug is no longer exhibited on my Windows 10 system with LR 9.3

Votes

Translate

Translate

Report

Report