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‌Chapter 78‌‌

Understanding Image Channels

This chapter seeks to demystify how Fusion handles image channels and, in the process, show you how different nodes need to be connected to get the results you expect.

It also explains the mysteries of premultiplication, and presents a full explanation of how Fusion is capable of using and even generating auxiliary data.


Contents


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Channels in Fusion������������������������������������������� 1544

Types of Channels Supported by Fusion� 1544

Fusion Node Connections

Carry Multiple Channels��������������������������������� 1545

Node Inputs and Outputs������������������������������ 1546

Node Colors Tell You Which

Nodes Go Together ������������������������������������������ 1549 Using Channels in a Composition������������� 1551 Channel Limiting ����������������������������������������������� 1552 Adding Alpha Channels����������������������������������� 1553

How Channels Propagate

During Compositing����������������������������������������� 1554 Rearranging or Combining Channels�������� 1554 Understanding Premultiplication ������������ 1555 The Rules of Premultiplication��������������������� 1557

Alpha Channel Status

in MediaIn and Loader Nodes���������������������� 1559

Controlling Premultiplication

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in Color Correction Nodes ����������������������������� 1560

Controlling Premultiplication With

Alpha Divide and Alpha Multiply ����������������� 1560 Multi Channel Compositing������������������������� 1561 Compositing with Beauty Passes���������������� 1561 Working with Auxiliary Channels���������������� 1567 Auxiliary Channels Explained ����������������������� 1569 Propagating Auxiliary Channels������������������ 1577 Nodes That Use Auxiliary Channels ����������� 1577

Image Formats That

Support Aux Channels ������������������������������������ 1579

Creating Auxiliary Channels in Fusion ������ 1579

 

Channels in FusionTypes of Channels Supported by FusionFusion Node Connections Carry Multiple ChannelsNode Inputs and OutputsNode Colors Tell You Which Nodes Go TogetherUsing Channels in a CompositionChannel LimitingAdding Alpha ChannelsHow Channels Propagate During CompositingRearranging or Combining ChannelsUnderstanding PremultiplicationThe Rules of PremultiplicationAlpha Channel Status in MediaIn and Loader NodesControlling Premultiplication in Color Correction NodesControlling Premultiplication With Alpha Divide and Alpha MultiplyMulti Channel CompositingCompositing with Beauty PassesWorking with Auxiliary ChannelsAuxiliary Channels ExplainedPropagating Auxiliary ChannelsNodes That Use Auxiliary ChannelsImage Formats That Support Aux ChannelsCreating Auxiliary Channels in Fusion

  

 

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