In DaVinci Resolve 14, some operations can be performed on all of the Y, R, G, B channels at the same time or only on one of them.
What is the difference between adjusting only Y, or adjusting all of YRGB? The effect looks the same.
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My statement that the effect looks the same was incorrect. The use of these sliders is explained in the manual, in "Primary Grading Controls" -> "Color Wheels Palette" -> "RGB Lift/Gamma/Gain Sliders" (page 725 in the v14 manual). Quoting:
... These three controls allow easy Y-only adjustments to contrast, where an increase in contrast results in perceptually diminished color saturation.
Making Y-only adjustments to contrast is a great way to increase contrast when you’re going for muted saturation or a gritty look. This kind of adjustment is also useful in situations where you’re trying to increase shadow density without increasing image colorfulness.
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Glad you found it. I knew the description of it doing the same thing was wrong from experience, but didn't have the manual handy to double check exactly what the difference was.– AJ Henderson ♦Oct 3 '17 at 20:26