To set resolution for the entire COPNET you can use the parameters of the COPNET
To set resolution of one stream/branch use `Layer` COP and connect it to the `size_ref` input of the first nodes
To export textures to disk use - `ROP image output` COP
To export to texture parameters inside Houdini use `op:/path/to/your/cop` in the target parameter, can be used pretty much anywhere in houdini where you usually import an image.