right. to give you an idea how bad a matrix profile fares on colours like this, here’s the cie plot:
see how in the blue corner (bottom left) everything goes way out the window? you can of course clamp these values to sane gamuts, but doing any kind of compute with these values is necessarily going to be rubbish (negative luminances are a common result).
here’s the plot with a lut profile estimated from the dng matrices for D65 and Illuminant A:
white balance is at 6504 (daylight) here, it gets a bit bluer if i go more towards tungsten, but will not break.