>>2961251Here's a gradient from 0 to 100 saturation. Top bar is unaffected, then 100 vibrancy, then 100 saturation.
Vibrancy boosts the saturation of colors with a medium level of saturation most, and colors with a high or very low level of saturation least.
(Normal) Saturation just raises or lowers the maximum value so that colors with a saturation level of 50 up to 100 become 100% saturated.
It's like the saturation version of raising brightness with curves by dragging up the mids VS clipping out the highlights.