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4 Delete the connection between the top Source input and Node 3, and then connect the bottom
Source input to the RGB input of Node 3.
Immediately, the image in the node thumbnail and Viewer updates to show the darker,
underexposed version of the HDR image. This is because, by default, the Layer Mixer is mixing
100% of Node 3 over Node 1.
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 Key Output Gain slider to
lower the contribution of Node 3 to the overall image. 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.
Dissolving between the regular and highlight exposures
of RED HDRx media using the Key Output Gain slider of
a Corrector node connected to a Layer Mixer node
TIP: You can also use the Blend Type and Blend Bias parameters in the Camera Raw
palette to blend the two exposures without building a dedicated node tree.
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.)
Isolating a region of the image to replace using the
highlight exposure image of a RED HDRx clip
Final node display with isolations
Chapter 143Channel Splitting and Image Compositing 2831
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