Left Toolbar > Math Nodes >
Rgbo Subtract
The RGBO Subtract node allows to subtract rgbo values. RGBO output: Red Green Blue Opacity.
On the left toolbar choose Point Nodes > Rgbo Subtract
Drag the Rgbo Subtract icon into the Node Graph.
Connect the Output .
rgbo_a A RGBO type.
rgbo_b A RGBO type.
result A RGBO type.
These attributes are exposed as input by default. Right-click the Node to hide the attribute as input and set the point values manually. Default R:0.0, G:0.0, B:0.0, O:1.0
rgbo A
rgbo B