Access to Cloudflare Images

I am setting up CF Images and it's been pretty rough so far. I got Direct Upload going and now I want to serve the image. It looks like serving the image via a worker and using the
fetch
subrequest is the most flexible way to go. However, it is beyond me how I can access the image given the image id from the worker? Am I supposed to pass it a complete variant URL instead? Is there a way to load the source image by it's ID and apply transformations to it instead?
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