Applying image transforms to remote images? Is there any way to apply an image transform (either CP-defined or template-defined) to a variable which represents the URL of a remote image? Naturally it would need to be cached locally, but since transforms are already cached I figure it's not too much of a stretch.

My use case is applying a transform to the thumbnail image of a video which is being fetched by an oEmbed plugin.
Imager plugin is capable of resizing remote images