I tried to use the chroma key operator tonight. It doesn't seem to be working properly. I just tried to use that to key away a certain colour for the background. It was not working very well. Is there any trick on it? I am new to Houdini's compositor! I used to use AfterEffects! Can anyone help me? I am a bit frustrated now because i don't even be able to do a simple task in Houdini's compositor!

Hi there,

To start picking the colour, please type ‘o’ in the viewport and use the LMB to pick.

When you move your mouse into the viewport, please look for the instructions below the playbar.

I hope the above helps!

Cheers!
steven