Quoted By:
Here's Joe Pugliese. Checkout how the shadows of all of the clothes have been tinted the same despite being different colors to contrast with the skin tones (which have also all been matched to the same hue). In the left image the highlights of the skin and the cloth in the background have been made the same hue but large difference in saturation keep them contrasting from one another. The faces have clearly been given more saturation while their surroundings have been reduced to make them stand out more. There's plenty of blue in the shadows of the skin tones but it has had its saturation reduced to blend in more. The complimentary hue of the skin shadows makes them feel snappier in contrast but the saturation has been reduced so they don't conflict. Blue shadows in the skin tend to be too high in saturation and the effect is ruined by the muddling of the two colors where they meet.
Masking in saturation that targets different luminosity levels can be as important as dodging/burning to adjust luminosity contrast across the image.