Ashley’s Light Fader 2.01✨: fade lights and/or color temperature with your choice of easing (curves), including ease-in, ease-out, and ease-in-out

[parautenbach (Pieter Rautenbach)]

@handcoding

I’m not theoretically opposed to considering adding support for lights that don’t use Kelvin. But the tricky part is that I just haven’t been able to find reliable formulas for converting from XY → Kelvin, Kelvin → XY, RGB → Kelvin, or Kelvin → RGB.

All the same, if by chance you—or anyone else—might be able to scrounge up some formulas for converting between those formats, I’d be open to giving some more thought to adding support for them.

(To potentially add support for XY, I would need a formula for converting from XY to Kelvin as well as a formula for converting from Kelvin to XY. Similarly, to potentially add support for RGB, I would need a formula for converting from RGB to Kelvin as well as a formula for converting from Kelvin to RGB.)

@handcoding

And I’m not trying to imply that those formulas don’t exist somewhere—they might? But I just haven’t been able to find them through my own googling.

@C.Potgieter

Any chance of supporting temperature fade for lights that don’t support Kelvin?
But rather an xy or rgb value for a “fake” temperature

@sparkydave

+1 for allowing other colour temperature methods.

For everyone’s benefit, there was a discussion around this some time ago and the best source I’ve come across is also the one that was quoted then.

You can go from XY to CCT (in Kelvin) with an approximation, but you cannot go the other way. You have to read the above article to understand why. These things aren’t equivalent. Mathematically, by trying to go from Kelvin to CCT doesn’t have a single solution: you’re going from one variable (Kelvin) to two (X and Y).

The equivalent is to ask: In a 3D room, I’m standing 1m from one of the walls. Where exactly in the room am I? You cannot answer this with a point. You could be standing (or floating) anywhere on a plane 1m from the wall.