I’ve written a python module that will convert a Kelvin color temperature to an RGB value (based on another Kelvin value for the reference, e.g. 3200K or 5500K). I have it working with as a CGI script, but I’d like to tie it into Blender with the proper GUI and hooks to lights in a given scene. My question is, “Is there interest for this?” I’ll probably wind up doing it anyway just for kicks, but if there’s a fair amount of enthusiasm for it, it’ll light a fire under me to do it.
For those new to Kelvin w/r/t lighting, most (incandescent) light is somewhere along the color spectrum from more orange to more blue, with white being right in between. Indoor film uses 3200 as it’s base for “white”, so lightbulbs (3000K) appear slightly yellow while outdoor light (5-6000 or more) appears bluish. Outdoor film sets white at 5500, so direct sun at noon appears white.
I figured this might be useful for people doing compositing or for folks (like me) who are just curious about the effect and want to model lighting “realistically”.