darktable-org / darktable-org/darktable

The edges tab of contrast equalizer does absolutely nothing

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Description

Is there an existing issue for this?
  • I checked and did not find my issue in the already reported ones
Describe the bug

I was trying to edit the raw file from here, applying the contrast equalizer resulted in a halo around the bridge. Now to confirm the statement in the title, I maxed out the edges graph, took a screenshot, then pulled it all down to minima and compared. No change at all.

This is probably not specific to my system since Bruce Williams mentions the same issue in his contrast eq video 6 years ago.

Steps to reproduce

grb the raw from the link in the description, apply the xmp in the additional context section (didn't find a better way to share it), try to adjust edges in the active contrast eq module.

Expected behavior

react to the changes in the edges tab

Logfile | Screenshot | Screencast

No response

Commit

No response

Where did you obtain darktable from?

Flatpak

darktable version

5.2.1

What OS are you using?

Linux

What is the version of your OS?

Fedora

Describe your system

Fedora, KDE, Intel integrated graphics as of yesterday (proprietary NVidia uninstalled, noveau blacklisted)

Are you using OpenCL GPU in darktable?

None

If yes, what is the GPU card and driver?

No response

Please provide additional context if applicable. You can attach files too, but might need to rename to .txt or .zip
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Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the issue with the linked raw file and XMP settings, then start at the active contrast equalizer module and its edges tab. Done means changing the edges control visibly changes the image and no longer leaves the control ineffective.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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