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Blend
The Blend control is used to blend between the tool’s original image input and the tool’s final modified
output image. When the blend value is 0.0, the outgoing image is identical to the incoming image.
Normally, this will cause the tool to skip processing entirely, copying the input straight to the output.
Process When Blend Is 0.0
The tool is processed even when the input value is zero. This can be useful if processing of this node
is scripted to trigger another task, but the value of the node is set to 0.0.
Red/Green/Blue/Alpha Channel Selector
These four buttons are used to limit the effect of the tool to specified color channels. This filter is often
applied after the tool has been processed.
For example, if the Red button on a Blur tool is deselected, the blur will first be applied to the image,
and then the red channel from the original input will be copied back over the red channel of the result.
There are some exceptions, such as tools for which deselecting these channels causes the tool to skip
processing that channel entirely. Tools that do this will generally possess a set of identical RGBA
buttons on the Controls tab in the tool. In this case, the buttons in the Settings and the Controls tabs
are identical.
Apply Mask Inverted
Enabling the Apply Mask Inverted option inverts the complete mask channel for the tool. The mask
channel is the combined result of all masks connected to or generated in a node.
Multiply by Mask
Selecting this option will cause the RGB values of the masked image to be multiplied by the mask
channel’s values. This will cause all pixels of the image not included in the mask (i.e., set to 0) to
become black/transparent.
Use Object/Use Material (Checkboxes)
Some 3D software can render to file formats that support additional channels. Notably, the EXR file
format supports Object ID and Material ID channels, which can be used as a mask for the effect. These
checkboxes determine whether the channels will be used, if present. The specific Material ID or
Object ID affected is chosen using the next set of controls.
Correct Edges
This checkbox appears only when the Use Object or Use Material checkboxes are selected. Ittoggles
the method used to deal with overlapping edges of objects in a multi-object image. When enabled,
the Coverage and Background Color channels are used to separate and improve the effect around the
edge of the object. If this option is disabled (or no Coverage or Background Color channels are
available), aliasing may occur on the edge of the mask.
For more information on the Coverage and Background Color channels, see Chapter 18,
“Understanding Image Channels,” in the Fusion Reference Manual or Chapter 78 in the
DaVinci Resolve Reference Manual.
Object ID/Material ID (Sliders)
Use these sliders to select which ID will be used to create a mask from the object or material channels
of an image. Use the Sample button in the same way as the Color Picker: to grab IDs from the image
displayed in the view. The image or sequence must have been rendered from a 3D software package
with those channels included.
Use GPU
The Use GPU menu has three settings. Setting the menu to Disable turns off GPU hardware-
accelerated rendering. Enabled uses the GPU hardware for rendering the node. Auto uses a capable
GPU if one is available and falls back to software rendering when a capable GPU is not available.
Chapter 109Miscellaneous Nodes 2158
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