> If, on the other hand, you want to resize the image, and *change* the 
> aspect ratio, I'd recommend that you actually read the scene files 
> (because you need to know about the scene, what is present, and where it 
> is placed).

I don't know about you, but I find it really hard to visualise what a scene 
will look like by just reading the scene files!  It's much easier to just 
look at a rendered version (either pre-rendered or I will render a quick 
preview myself).

Why not just have a flag/setting:

What should POV do if the requested image aspect does not match the scene 
aspect ratio?
[ ] Adjust image dimensions for letterbox result
[ ] Adjust image dimensions for zoomed/cropped result
[ ] Adjust camera horizontal FOV to match
[ ] Adjust camera vertical FOV to match
[ ] Render non-square pixels

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