> Later however, I found the time to revisit the issue, and found that
> good results /can/ be obtained; the key is to split up the colour
> information into brightness (i.e. the weighted sum of the colour
> channels) and chroma (i.e. the relative balance between the colour
> channels), interpolate the brightness non-linearly and the chroma
> linearly, and then re-combine the two properties into the new result colour.

Never realised that this had been implemented - great work!

What chroma values are you using?

Have you heard of MacAdam ellipses?

https://en.wikipedia.org/wiki/MacAdam_ellipse

My idea is that if you convert your chroma values to a colour space with 
almost equal-sized MacAdam's ellipses, you can then just do a linear 
interpolation in that colour space, and you should get "perfect" hue 
blends for any colours.

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