https://bugs.kde.org/show_bug.cgi?id=518585

            Bug ID: 518585
           Summary: Grayscale filter does not work properly
    Classification: Plasma
           Product: kwin
      Version First 6.6.3
       Reported In:
          Platform: EndeavourOS
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: effects-various
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 191297
  --> https://bugs.kde.org/attachment.cgi?id=191297&action=edit
grayscale is only partially reducing color

SUMMARY
The grayscale filter that was introduced in
https://invent.kde.org/plasma/kwin/-/merge_requests/8106  (fixing the bug
https://bugs.kde.org/show_bug.cgi?id=485304) does not produce a grayscale
effect

STEPS TO REPRODUCE
1. Open system settings
2. Accessibility -> Colorblindness correction -> Enable 
3. Select "All (grayscale mode)" and Apply

OBSERVED RESULT

Color is reduced a bit, but the screen is not full grayscale (see attached
image).

EXPECTED RESULT

Color should be gone
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS
KDE Plasma Version: 6.6.3
KDE Frameworks Version: 6.24.0
Qt Version: 6.11.0

ADDITIONAL INFORMATION

Issue also occurs for a new user. Therefore, this is not a local configuration
issue. Also see the comment in
https://invent.kde.org/plasma/kwin/-/merge_requests/8106#note_1463344

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