Communication between Automation and Filter Plugin

Hi,

I am new into plugin development and have recently developed a Filter Plugin which seems to be working well except for one usecase which I missed during the development process.

I need to increase the document or canvas or image size within the filter. The documentation provided for SDK says that I cannot increase the canvas size within Filter Plugin and I have to use other plugin types like Automation or Export modules.

So I explored Automation module with the hidden plugin interface and this seems to work fine in my case where I can invoke my filter within the Automation Plugin. But how can I communicate betwee the Filter Plugin and Automation Plugin when the Document size needs to be increased while my Filter Plugin is still running.

Your help is well appreciated.

thx

Chidu