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Add cividis and oranges colorblind-friendly isochrone palettes (#191)#398

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AaravJalan:fix/191-colorblind-isochrone-palette
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Add cividis and oranges colorblind-friendly isochrone palettes (#191)#398
AaravJalan wants to merge 3 commits intovalhalla:masterfrom
AaravJalan:fix/191-colorblind-isochrone-palette

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@AaravJalan
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🛠️ Fixes Issue

Closes #191

👨‍💻 Changes proposed

Adds two new colorblind-friendly palette options to the isochrone color picker:

  • Cividis: perceptually uniform, optimized for color vision deficiency
  • Oranges: sequential single-hue palette, accessible for deuteranopia/protanopia

Also adds unit tests verifying palette presence and correct labeling.

📄 Note to reviewers

Note: I'm a GSoC 2026 applicant interested in the Valhalla and OSM routing projects.

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Preview is ready! 🚀 You can view it here: https://valhalla-app-tests.gis-ops.com/398

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@nilsnolde nilsnolde left a comment

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hm, that issue should've been closed. we're already good IMO, not sure why we need more. we can merge, but then:

  • please remove the oranges, that's not a nice color scale
  • re-order so that colorblind-friendly come last

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[Isochrones] Use a color scale that is colorblind friendly

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