> Alright then, let's ask this:
>
> What should the behavior be, when a scene is composed "without a second 
> thought for anyone else," and originally rendered in the default 4:3 
> aspect ratio... and you want to render it in a 3:4 aspect ratio for a 
> vertical poster?
>
> How should POV handle this?

IMO the default behaviour should be to preserve the horizontal FOV, as this 
is usually where the detail is modelled - more or less vertical FOV tends 
just to be more or less sky or emtpy ground.  So in your example the 3:4 
rendering would show more sky and ground (or whatever is in the image) than 
the original rendered at 4:3.

> Perhaps a sensible compromise would be that if only the width or height of 
> the file is set, and not the other, POV will assume square pixels and 
> adjust the other according to the camera aspect ratio.  That is, if you 
> set +w1600, and don't set height, POV will check the camera aspect ratio 
> (up and right vectors) and, in the case of the default 4:3, set +h1200 on 
> its own (and other values according to other ratios).  This would 
> certainly make scaling images easier.

So explain how you render a 3:4 version for a poster with your compromise?

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