Silly HSI question

So, this seems like it should be pretty basic, but the solution eludes me...

Is there a trick for making fades between HSI colors without going through the colors in between? For instance, a fade from Blue to Amber without everything turning GREEN in the middle would be nice.

I've got a bunch of RGB LEDs and some StudioColors on my RoadHog. At least, thanks to color matching, they all do the same thing together!

Thanks in advance for any help...

Cheers!
--Ben
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