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3 Right-click anywhere within the node graph (except on a node) and choose Add Source
from the contextual menu.
A second Source input appears underneath the first, which outputs the highlight
exposure of the image as a separate image stream.
A node tree that uses a Layer Mixer node to mix two
Corrector nodes, each connected to separate outputs for
the regular and highlight exposures.
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 (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.
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.
Chapter – 127 Channel Splitting and Image Compositing 2884