Auto adjust image improvements: Overexposure reduction and removes UI thread block

[moschmdt]

Description

The issue is already described extensively in #568.
Additionally, the auto adjust for multiple images has been put in a thread not blocking the UI and includes a progress indicator now.

Type of Change

• Bug fix
• Code refactoring
• UI/UX improvement

Changes Made

• Add blacks/whites to the AutoAdjust structure to counter high exposure
• Reduce the scaling variables
• Name the scaling variables, so in the future something like custom configs could be possible for auto adjust.

Screenshots/Videos

Previous behavior see #568.

Testing

• I have tested these changes locally and confirmed that they work as expected without issues

Test Configuration:

• OS: macOS Tahoe
• Hardware: M1 Pro

Checklist

• My code follows the project's code style
• I haven't added unnecessary AI-generated code comments
• My changes generate no new warnings or errors

Additional Notes

AI Disclaimer:

Please state the involvement of AI in this PR:

• This PR is entirely AI-generated
• This PR is AI-generated but guided by a human
• This PR was handwritten with AI assistance (spell check, logic suggestions, error resolving)
• This PR contains only blood, sweat, and coffee (AI-free)

[CyberTimon]

Thanks for your PR. Can you please just commit the backend changes, as the UI side will follow a different design?

[moschmdt]

Done! Thank you for creating this project!

[CyberTimon]

@moschmdt Thanks so much for the quick change! Very nice. Can you please lastly remove the AI code comments or keep them to a very minimum (just the ones absolutely needed) and fix the merge conflict? In the last version, I've already moved the processing to a seperate thread, so probably just the improved auto adjust algorithm is needed. Thanks!

[moschmdt]

I will have a look at it!

What do you think about exposing the variables for the auto-adjust algorithm via settings to the user to fit the user’s expectation more precisely/ make experimentation easier without recompile?