> any size you like but image must have width = 2 x height.

No; regardless of an image's size, it will be treated the same way by
POV-Ray. This means it will be squeezed into the unit square from <0,0,0> to
<1,1,0>, even if doing so changes its proportions. (If spherical mapping is
used, the image will similarly wrap all the way around the sphere no matter
what its width or height is.) It's up to the user to resize the image as
necessary.

 - Slime
 [ http://www.slimeland.com/ ]

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