Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 248)

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We’ll see how you can attempt to correct this sort of issue using the RGB Mixer.
To patch blown-out channels with sections of other channels:
1. First, identify the region of the image with clipped out highlights or shadows that
you want to try to fix, then add a node and isolate the clipped region using HSL
Qualification. You can either key a range of color, or luma only using the controls of the
Luma tab.
This technique only works for images where a single color channel is clipped, but image detail
exists in the other two.
2. Open the RGB Mixer tab, and use the control group corresponding to the clipped color
channel to add image data from the other two channels.
For example, if the red channel is clipped, use the parameters in the Red control group
to raise the Green and Blue parameters in whatever proportion works to add a bit of
detail back to the clipped area of the red channel. It can be easier to see what you’re
doing if you check an RGB Parade scope’s analysis of the image.
Left–the original Red channel mix; Right–mixing parts of the green and blue
channels into the red channel, with less red