User guide

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Control (UI) Default Value Function
displayWindow Background The frame size to output in the event that the fg and bg inputs
are different sizes:
• Background - output the frame size of the bg input.
• Foreground - output the frame size of the fg input.
• Union - output a combination of the bg and fg inputs' frame
sizes.
• Intersection - output an intersection of the bg and fg inputs'
frame sizes. This restricts the output to the area where the
two frame sizes overlap.
clampAlpha enabled When enabled, the output alpha channel is clamped to the 0-1
range. Color channels (RGB) are not affected.
ImageOver
This node layers images together using the Over compositing algorithm: F+B(1-f). This layers the foreground over
the background according to the alpha of the foreground. This is the most commonly used operation. It's used when
layering a foreground element over a background plate.
Also see ImageUnder on page268.
Control (UI) Default Value Function
R enabled When enabled, affect the red channel of the image.
G enabled When enabled, affect the green channel of the image.
B enabled When enabled, affect the blue channel of the image.
A enabled When enabled, affect the alpha channel of the image.
mix 1 Dissolves between the bg image at 0 and the full merge effect at
1.
Mask
4 NODES I-K | IMAGEOVER