…we have also added a “reduce eye strain” mode, which changes the tone
of the light emitted by the screen from blue-violet to warm
red-orange, which is more pleasant at night, reduces eye fatigue, and
won’t keep you awake.
It might be doable with <feComponentTransfer>. SVG filter primitives are really weird and seem like they were grafted on from someplace else, so they tend to be capable of things you woudn’t necessarily suspect.