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‌Chapter 143‌‌

Combining Keys and Using Mattes

A key is the actual image channel that’s generated by different secondary operations to isolate specific portions of images to work on.

This chapter covers different ways you can manipulate and combine keys from multiple nodes, or propagate keys among nodes. It also shows different ways you can use mattes that are imported from other applications, as well as how to use the Key palette to further manipulate keys in different ways.

Contents

Introduction to Manipulating

and Combining Keys ��������������������������������������� 3179

Outside Nodes ��������������������������������������������������� 3179

Feeding Keys From

One Node to Another ������������������������������������� 3180

Connecting Key Outputs to

RGB Inputs, and Vice Versa ������������������������� 3182 Using External Mattes ����������������������������������� 3184 External Mattes to Limit Adjustments 3185

Extracting External Mattes

from OpenEXR Layers 3187

Using External Mattes to Add Texture 3188

Using External Mattes to

Create Transparency 3189

Key Palette Controls for the

External Matte Node 3190

Using Mattes From the Fusion Page ������� 3191 Using the Key Mixer ���������������������������������������� 3193 Adding Two Keys Together 3193 Subtracting One Key from Another 3195 Adding Inputs to Key Mixer Nodes 3197 Using the Key Palette ������������������������������������� 3198 Using the Key Palette to

Affect Corrector Nodes 3198

Using the Key Palette to

Adjust Key Mixer Controls 3199

The Many Uses of Key Output Gain 3200

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