Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 194

This results in RGB values of 0.8418, 0.993, and 1.22, respectively. It gives the
image a nice-looking blue shadow tint. Notice that there are actually no hue and
saturationslidersintherealProperties.ThehueandsaturationslidersintheColor
Wheel and Color Sliders panel are only there so it will be easier to set the RGB
sliders.
14. Close this Color Wheel and Color Sliders panel.
15. You have a lot more work in the midtones. First, set the Saturation to 0, so that
the midtones are tinted black and white.
16. To create a flatter palette to work on, set the Contrast for midtones at 0.9.
17. To darken the midtones, set the Gamma to 0.69.