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A typical dissolve node structure in Fusion
Resolution Handling
It is recommended to make sure that all images connected to the foreground, background, and
gradient map inputs of the Dissolve node have the same resolution and the same pixel aspect. This is
not required, however. But, the result if you mix resolutions depends on how you set the Background/
Foreground slider.
– If the input images are different sizes, but the Foreground/Background slider is set to full
Foreground (all the way to the right) or full Background (all the way to the left), then the output
resolution will be identical to the image resolution of the corresponding node input.
– If input images of different sizes are mixed by setting the Background/Foreground slider
somewhere between, the output resolution will be set to the larger of the two input resolutions
to make sure there’s enough room to contain both images. In this case, you may experience
undesirable resolution changes when the slider moves from full foreground or background to
somewhere in between.
For example, if you try to dissolve between a 4K image (connected to the background) and an 8K
image (connected to the foreground), the output of the Dissolve node will be 4K when the slider is
set to full Background, but will suddenly jump to 8K when set to full Foreground or when mixed
somewhere between the foreground and background.
Inspector
Dissolve controls
Controls Tab
These are the main controls that govern the Dissolve node’s behavior.
– Operation Pop-Up: The Operation menu contains one of seven different methods for mixing
the Foreground and Background inputs. The two images are mixed using the value of the
Background/Foreground slider to determine the percentage each image contributes.
– Dissolve: The standard Dissolve mode is the equivalent of a cross dissolve: one clip fades out
as another clip fades in.
– Additive Dissolve: Similar in look to a standard film dissolve, an Additive dissolve adds the
second clip and then fades out the first one.
– Erode: The Erode method transitions between the two images by growing the darkest areas of
the background image to reveal the foreground image. The effect appears similar to a filmstrip
burning out.
– Random Dissolve: A randomly generated dot pattern is used to perform the mix of the images.
Chapter 95Composite Nodes 1858
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