I want to desaturate an image form colour to black and white within Houdini. I understand this can be done in a COP2 Network. WHich node would I use to desaturate and which parameter do I adjust?

The image is an HDRI to be used in an Environment Light, so I assume this is the method to use.

HSV node, turn saturation scale down.

Hi,

You can use the HSV COP:

mestela beat me to it dammit!

Thanks, how do you show the image in the viewport? Composite View presumably?

OK Got it to work. Thanks.

It shows a desaturated image in the Composite View OK.

litote
Thanks, how do you show the image in the viewport? Composite View presumably?

OK Got it to work. Thanks.

It shows a desaturated image in the Composite View OK.

If you cook the COP network node, it should show the result in the viewport.

How do I stop the COP2 Network image showing in the Scene View? Presumably I have to put it inside a Geometry node and deactivate its display flag?

litote
How do I stop the COP2 Network image showing in the Scene View? Presumably I have to put it inside a Geometry node and deactivate its display flag?

You can display another node like a null node.

I think My app was acting oddly. The image does not show in the Scene View now, so it may have been a glitch.