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by raphlinus 1913 days ago
Interpolate in a perceptual space such as Oklab?

Possibly use a radial basis function for interpolation rather than triangles? I don't have JavaScript code handy but rbf-interp[1] is Rust code that could either be adapted or called from wasm.

[1]: https://crates.io/crates/rbf-interp
2 comments
grgrdvrt 1913 days ago
The triangles-based interpolation is indeed problematic. It has the advantage to be fast and super easy to implement in webgl with an arbitrary number of points. I don't understand everything yet about the rbf interpolation but it looks very interesting, I'll look into it.

A better color space can also help with some issues (in the demo the darker colors are harder to reach when blending with the black point than lighter colors are when the white point is involved) but how I understand it the colors in a triangle are influenced by the colors and shapes of the surrounding triangles, whatever the color space.

I must say that I'm very happy to have had your input on this. I'm a big fan of your work and your blog is a real treasure!

Thank you!

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nom 1913 days ago
This! Interpolating in linear RGB space is the biggest issue, I'm sure it will improve a lot simply by using a more suitable colorspace. Triangles might not be noticable at all then, except in extreme cases (which are undesirable anyways).
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grgrdvrt 1913 days ago
I'll try a different color space, for sure, but I think the interpolation method is the real culprit. I have the feeling that in a configuration like this:

  A-B
  |/|
  C-D
the position of D could have an impact on how ABC is rendered.

But I'll try another color space first, it should be easier to implement.

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