Clamp Colors in Fusion

Software:
Fusion 9

To Clamp (limit / clip) the color values in a Fusion flow:

1. Add a Color > Brightness / Contrast node to the composition and connect it to the desired output.
2. and activate the Clip Black and Clip White options at the bottom of the Brightness / Contrast node parameters.
3. Set the Low and High parameters to set the wanted color limits.]

Related:
Clamp colors in Photoshop 32 bit float color mode