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I guess what confused me was

I guess what confused me was that scale_colors() also includes (or rather excludes when disabled) white balance, which is usually important in exactly the advanced interpolation use case you described... no biggie, because the advanced user could easily do the white balance before their custom interpolation, it was just unexpected/undocumented, so at least making it somewhat more explicit in the API docs would help avoid having to find out the hard way ;)