Left Toolbar > Adjust Nodes > Invert
The Invert Node inverts the color pixels. Blend it with the original image to add more options to adjust the output image.
On the left toolbar choose Adjust Node > Invert Node
Drag the Invert icon into the Node Graph.
Connect the output of an image node into the Img input in the Invert node.
Connect a Mask image ot the Mask to apply invert effect to an specific area.
Set the blend mode and opacity to modify the output image.
Img The image to be adjusted. Mask image.
Img The adjusted image.
The adjusted image is blended with the input image to provide additional adjustment options.
Blend Mode The blending mode: Normal, Multiply, Divide,Screen, Overlay, Dodge, Burn, Hard Light, Soft Light, Grain Extract.
Opacity The opacity of the original image in the blending process.