Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 217)

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5. Select node 3 and use one of the following two procedures to create a useful combination
of the two exposures:
• To create a mix of the two exposures, open the Key tab, and drag the Post Mixing
Gain slider to the left to lower the contribution of node 3 to the overall image (you
can also do this using the DaVinci control panel by pressing the KEY MODE soft
button, and then using the Post Mix Gain rotary control). Using dynamics (keyframing),
this is a good way to animate a dissolve from the regular exposure to the highlight
exposure if you’re going from a dark environment to a bright environment in the
same take and you want to create a smooth transition between both exposures.
• To use the highlight exposure to selectively put detail back into the image (for
example, to retrieve blown-out windows), use a Power Window, HSL Qualification, or
a combination of the two to isolate the region you want to retrieve in node 3. Be
careful if you’re using HSL Qualification to combine both exposures, as keyed edges
can be tricky to blend.
Dissolving between the regular and highlight exposures of RED HDR media using the Post
Mixing Gain slider of a Corrector node connected to a Layer Mixer node.