Hasta La Motion!

So I have a plate that is 4480×1920, and I try to comp in an image that is 2240×960. It is to be comped in the background & out of focus, distorted etc, and subject to the larger image’s alpha. Easy enough.

But, I attach both images to a Merge(over) node and find that the image area now only displays a small part of the 2240×1920 image, it’s like the image is cropped to the size of the smaller image. I try to set the Merge node to accept metadata from the larger image (which is input A), but I don’t see any effect.

It’s this kind of annoyance that’s making it difficult to "simply work" as I did in Shake. Reading the Nuke documentation seems to imply that I’m already doing what I need to, but obviously I’m not. Anyone know what I’m talking about and have any common knowledge to impart? 🙂

Kindest regards

DMarkwick