How to find an ImageID for "Gold Master" image?

How do you determine what the image ID is for a "gold master" disk you've created? I created a gold master backup image using the dashboard I/F. I now would like to write a Python program that uses the Linode API's linode.disk.createfromimage() method to create a new configuration profile from my gold master. The problem is that this method requires an ImageID and I don't see how I can find out what it is either manually or via an API method. It looks like the only way you can get the image ID is to create your image using the linode.disk.imagize() method and then examine and write down the ImageID it returns. Is there some easier way to get the image ID?

By the way, I don't think you can use linode.disk.list(). It only shows me disks I've already created.

Thanks!