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FX Refine section of the Effects library, directly into the Node Graph. You can also drag it on top of an existing link in the Node Graph to place it inline.
The Custom Mixer node is connected in the following way. The first and second RGB (Green) inputs are input 1 and input 2 respectively. The alpha of the second input controls the blend of input 2 onto input 1. The Alpha of the 1st input does not affect the result; it is passed through the node to the output key.
The Custom Mixer Node connections: Input 1 (Green triangle above), and Input 2 (Green triangle below). The alpha from Input 2 controls the blend
of Input 2 onto Input 1 and is what you modify in the Custom Mixer controls.
The Custom Mixer has two main modes chosen by the Mix mode; both have the same behavior, just different controls to change how the input affects the output.
Blend
Blends the second input onto the first input. The normal range is from 0 (fully input 1) to 1 (fully input 2), however you can set the blend factor up to 10 times more or less by typing the
numbers directly into the fields. This allows you to enhance the difference between inputs beyond the appearance of either one alone. All the sliders can be keyframed independently.
— Blend Input 2 onto 1: Controls the strength of each source, based on the color channels of the selected color space (RGB, YUV, XYZ, etc.). These can be adjusted separately if the Gang checkbox is unchecked.
— Gang: Check this box to gang the channels of the custom mixer together, or uncheck to adjust separately.
Combine
Combines the inputs together, allowing you to change the relative strength of each input’s contribution to the mix. The normal range is from 0 (fully input 1) to 1 (fully input 2), however you can set the blend factor up to 10 times more or less by typing the numbers directly into the fields. This allows you to enhance the difference between inputs beyond the appearance of either one alone. All the sliders can be keyframed independently.
— Input 1 Contribution: Controls the strength of input 1’s source, based on the color channels of the selected color space (RGB, YUV, XYZ, etc.). These can be adjusted separately if the Gang checkbox is unchecked.