User guide

208
Control (UI) Default Value Function
channel A The channel from the out_mask input to use as a mask:
• R - use the red channel as the mask.
• G - use the green channel as the mask.
• B - use the blue channel as the mask.
• A - use the alpha channel as the mask.
By default, the mix effect is limited to the non-black areas of the
mask.
invert disabled Inverts the use of the mask channel so that the mix effect is
limited to the non-white areas of the mask.
fringe disabled When enabled, the mask is modified so that by default the mix
effect is limited to the fringe (semi-transparent areas).
amount 1 An optional bias for the mix operation. See amountMath for
details.
amountMath Normal Select the mode to use:
• Normal - In this mode, an amount of 1 means to obey the
matte fully. An amount of less than 1 means to mix in more
of the original bg image. This corresponds to artists'
expectations.
• Compatibility - In this mode, an amount of 0 favors the bg
image. An amount towards 1 favors the fg image. 0.5 is the
non-biased setting.
matteChannel A Specifies which channel in the matte input contains the matte.
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.
4 NODES I-K | IMAGEMATTEMIX