Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 266)

COLOR 266
About the Hue and Sat Curves
Three sets of hue curves, and one additional Lum vs Sat curve, let you make other curve-based
alterations to the image. Whereas the Custom curves let you make adjustments to the color channels
of an image based on tonality, for example boosting the red channel in the highlights while lowering it
in the shadows, the hue curves let you make adjustments to the hue, saturation, or luma of elements in
an image, based on their hue.
For example, you could use the Hue vs. Sat curve to selectively lower the saturation of everything that’s
blue, while raising the saturation of everything that’s green.
Top–Original image, Bottom– the image as altered by the Hue vs. Sat curve shown in the middle