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button to move the selected layer up a layer, or the
button to move it down a layer.
To rename a layer:
1 Select the layer by clicking on the red or blue box to the right of the layer.
2 Click the Layer Name field in the blend node menu.
The on-screen keyboard appears.
3 Press Esc to remove the previous name and type a new name.
4 Press Enter to save the name.
Bypassing Pipes
On blend nodes, you have the option of inputting a source image from another node on the pipeline,
effectively bypassing the pipes (for example, using the key-in clip matte in a colour correction in the Matte
pipe of the CBlend node). Instead of copying all the nodes in the Front pipe of the MBlend node, you could
just add a branch from the end of the MBlend Front pipe to the blue box on the CBlend node.
When attaching an alternate input source to a Matte pipe, you should use a matte image. If you use a colour
image, it will be converted to greyscale.
NOTE To do this, you cannot have any nodes on the pipe receiving an alternate input source.
Creating and Refining a Key in the Master Keyer
Use the Master Keyer method to create a complete key—extract colours to generate a matte and then refine
the result—using only the Master Keyer menu. The Master Keyer uses an algorithm that quickly isolates a
colour and is very good for chroma keying.
With the Master Keyer, you can refine the key by gesturally modifying the matte, removing colour spill,
blending edges, applying patches, and removing grain.
686 | Chapter 16 Chroma Keying and Working with Green Screens