User Manual

Table Of Contents
Chroma Keyer [CKY]
The ChromaKeyer node
Chroma Keyer Node Introduction
The Chroma Keyer node creates an Alpha channel (matte) for an image by removing selected
colors from the scene. Unlike the Delta Keyer or Primatte, which use specific optimizations for
keying from blue and green colors, the Chroma Keyer works equally well with any color.
NOTE: When working with blue- or green-screen shots, it is best to use the Delta
Keyer or Primatte node, rather than the more general purpose Chroma Keyer node.
Inputs
The Chroma Keyer node includes four inputs in the Node Editor.
Input: The orange input accepts a 2D image that contains the color you want to be
keyed for transparency.
Garbage Matte: The gray garbage matte input accepts a mask shape created by
polylines, basic primitive shapes, paint strokes, or bitmaps masks. Connecting a
mask to this input causes areas of the image that fall within the matte to be made
transparent. The garbage matte is applied directly to the Alpha channel of the image.
Solid Matte: The white solid matte input accepts a mask shape created by polylines,
basic primitive shapes, paint strokes, or bitmaps masks. Connecting a mask to this
input causes areas of the image that fall within the matte to be fully opaque.
Effect Mask: The optional blue input expects a mask shape created by polylines,
basic primitive shapes, paint strokes, or bitmaps masks. Connecting a mask to this
input limits the pixels where the Alpha multiply occurs. An effects mask is applied to
the tool after the tool is processed.
Basic Node Setup
The Chroma Keyer node takes in a 2D image like the MediaIn node below and removes a color
that you identify by dragging over it in the viewer. The result is that the selected color is
replaced with transparency, allowing you to composite the image as the foreground in a
Merge node.
Chapter – 98 Matte Nodes 2141