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mbostock avatar mbostock commented on April 23, 2024

The bug here (if there is one, and I think there is) is that the hue for white (or another achromatic color) is a number rather than NaN. If the hue is NaN then the interpolator will do the right thing.

Previously I thought that the non-NaN (NNaN) hue for white was an artifact of the D65 referent but it seems I was mistaken. We should fix this as part of your work to make d3.lab and d3.lch consistent with other implementations.

(Also would be great to implement chroma clamping…)

from d3-interpolate.

mbostock avatar mbostock commented on April 23, 2024

Fixed in d3-color 1.0.4.

https://beta.observablehq.com/@mbostock/achromatic-interpolation-test

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