User Manual

compositing images smaller than the raster, or with transforms. By default, the canvas color
used is black/no Alpha (transparent). However, since some nodes may change an image’s
canvas color—for example, inverting a mask changes the mask’s canvas from black to white—
the Set Canvas Color allows you to control the color of the canvas to whatever you require.
The Set Canvas Color node sets the color of the workspace outside the domain of definition
(DOD). For example, if you create a circular gradient, the DoD is a square around the circular
gradient in the viewer. Everything outside the DoD is understood to be black and therefore
does not have to be rendered. To change the area outside the DoD, attach the Set Canvas
Color node after the background and change the color.
NOTE: Position the mouse pointer in a black area outside the raster to view the RGB
canvas color in the status bar at the bottom left of the Fusion window.
Inputs
The Set Canvas Color node includes two inputs: one for the main image and a second for a
foreground.
–
Input: This orange input is the only required connection. It accepts a 2D image that
reveals the canvas color if the image’s DoD is smaller than the raster.
–
Foreground: The optional green foreground input allows the canvas color to be
sampled from an image connected to this input.
Basic Node Setup
The Set Canvas Color node is placed after the image is transformed to reveal part of the raster
outside the domain of definition.
A Set Canvas Color node applied to a transformed MediaIn 1 node
The Set Canvas Color node is often used for adjusting keys. In the example above, the Luma
Keyer is extracting a key, and therefore assigns the area outside the DoD, which is black, as an
opaque foreground. If the element is scaled down and composited, you do not see the
background. To correct this, insert a SetBGColor before the keyed element is placed in the
composite. For example, LumaKey > Set Canvas Color > Transform > Merge.
Chapter – 85 Color Nodes 1896