feat: Add gamma correction toggle

[igoroctaviano]

• feat: Add gamma correction toggle dicom-microscopy-viewer#238

Summary

Adds a Gamma correction switch in Settings → Display (next to ICC Profiles) so users can enable/disable palette display gamma compensation at runtime.

Depends on DMV exposing setPaletteDisplayGammaCorrectionEnabled / getPaletteDisplayGammaCorrectionEnabled (slim#384, follow-up to dicom-microscopy-viewer#211).

DMV PR: (link dmv-pr branch / PR here)

What changed

• SlideViewer.tsx

  • State: isPaletteDisplayGammaCorrectionEnabled (initialized from volumeViewer.getPaletteDisplayGammaCorrectionEnabled()).
  • Handler handlePaletteDisplayGammaCorrectionToggle → volumeViewer.setPaletteDisplayGammaCorrectionEnabled(checked).
  • Settings panel: Gamma correction switch under Display, beside ICC Profiles.
  • After constructViewers on route/slide change, reapplies stored preference via setPaletteDisplayGammaCorrectionEnabled.
  • Custom segment palettes use the viewer’s current gamma flag when built.

• SlideViewer/types.ts — isPaletteDisplayGammaCorrectionEnabled on component state.

• types/dicom-microscopy-viewer/index.d.ts

  • VolumeImageViewerOptions.paletteDisplayGammaCorrection
  • setPaletteDisplayGammaCorrectionEnabled / getPaletteDisplayGammaCorrectionEnabled
  • PaletteColorLookupTable / buildPaletteColorLookupTable gamma options

Dependency

Bump dicom-microscopy-viewer to a release that includes the gamma toggle API (after the DMV PR merges).

Until then, local testing:

1. In dicom-microscopy-viewer: bun link (or npm link).
2. In slim: bun link dicom-microscopy-viewer and reinstall, or use "dicom-microscopy-viewer": "file:../dicom-microscopy-viewer" and run npm run build in DMV so dist/ matches src/.

Note: Slim’s webpack alias resolves DMV to dist/dynamic-import/dicomMicroscopyViewer.min.js. A linked package without rebuilding dist will not pick up new APIs.

How to test

1. Start Slim with a DMV build that includes the gamma API.
2. Open a slide that uses palette LUT channels (e.g. CyCIF-style data), not only true RGB color.
3. Open Settings (gear) → Display.
4. Toggle Gamma correction:
   • On (default): brighter mid-tones, consistent with PR #211.
   • Off: linear palette mapping (darker mid-tones).
5. Change series/slide and confirm the toggle state is restored.
6. With visible segmentations or parametric maps, confirm overlays update when toggling.

Limitations

• No effect on true RGB optical paths or monochrome tint-only channels (no palette LUT).
• ICC Profiles and Gamma correction are independent settings.

Related

• slim#384
• dicom-microscopy-viewer#211

[deepsource-io]

DeepSource Code Review

We reviewed changes in 4313727...51dd4cc on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
JavaScript		Aug 5, 2026 5:06p.m.	Review ↗

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[fedorov]

@igoroctaviano let's merge this.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

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