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Rugged horizon

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W. Paul
Posted on Thursday, August 23, 2001 - 6:07 pm:   Edit PostDelete Post

Application is great indeed, but there's one (as for now, I started using it today) problem, solution to which I could find neither in documentation nor in FAQs: is there chance to obtain even horizon (i.e. not waving in the rhythm of warped photo edges, but as a smooth arc - I don't dare to dream of straight line... ) in panoramas made with camera tilted slightly downwards? (Often you've got more interesting objects below than above horizon). Couldn't the "artificial horizon" line in "Crop" procedure be assigned to use in determining which level should serve as basic for individual photos?
[I'm using 1.6 version]

Best wishes,
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John Strait
Posted on Saturday, August 25, 2001 - 11:25 am:   Edit PostDelete Post

To avoid a horizon that is "waving in the rhythm of warped photo edges" you must be sure to rotate the camera around its own vertical axis. Think of placing the camera on a slanted surface and then rotating the camera without changing the angle of the surface.

This is the correct way to rotate the camera:
camera rotated correctly

If you rotate the camera correctly, you'll notice two things:

1. The amount that the camera tilts downwards will vary as it rotates. In fact, it will tilt upwards at some points if you make an image that is wider than 180 degrees.

2. The horizon line in your finished image will be a smooth, sweeping arc. It will not be scalloped the way it is when you rotate the camera incorrectly.

The correct rotation produces images with the "top of the world" effect. See http://www.panphoto.com/Weisenburger1.html for an example.

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