OpenJPEG can give me the header info with the image size, and then I can ask for a fraction of the resolution without reading the entire stream. But I don't think you expose that functionality. Is there some way to do that?

Use case is wanting a low-rez version from the asset server for Open Simulator or Second Life. Often, many assets are only read at low-rez because they are for distant objects. So the network connection only reads part of the data and then is closed.

(Current code is running OpenJPEG in a subprocess, and reading too much. Looks like this: https://player.vimeo.com/video/640175119)