Wrong Icon Colors for not so dark bg colors

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Nextcloud version (eg, 20.0.5): 28.0.3 AIO
Operating system and version (eg, Ubuntu 20.04): Debian 12
Apache or nginx version (eg, Apache 2.4.25): Docker AIO latest
PHP version (eg, 7.4): Docker AIO latest

The issue you are facing: After official migration from 27.1.3 to 28.0.3, icon colors are now wrong for a set of colors (n>3)

Is this the first time you’ve seen this error? (Y/N): Y, right after migration.

Steps to replicate it:

  1. Go to “Theming”
  2. Choose a not-so-dark-yet-not-bright-enough color (like orange, yellow, whatever)
  3. Expected results: white icons should start showing up way sooner than the new threshold, imho
  4. Actual results: icons are black for the official UI, but are OK for anything related to additional GUI-managing apps (like Custom Menu)

Here is a small set of hexa codes for which I believe this should really not happen (since they are taken from the main official presets):

  • #BF678B
  • #C98879
  • #6EA68F
  • #3794AC

My opinion is that it really is subjective to the end user, and not really linked to hue, darkness, or even whether browser or os is in Dark mode or not. I think this is really personal and hence I would suggest to integrate it as a separate setting in Theming: Foreground color.

What is interesting is that switching from Light to Dark reverses the secondary color, making it either lighter or darker than the main color. Yet, the color of the icons on the main top MenuBar stays the same (which makes sense to me, but again, it’s probably very personal).

The output of your Nextcloud log in Admin > Logging:

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The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

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The output of your Apache/nginx/system log in /var/log/____:

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Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.

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