This is a pretty cool technique.
http://www.flickr.com/photos/92947261@N00/169626218/
Directions from here:
http://flickr.com/photos/snarfo/119870372/
- First create a Full 360 Degrees Panorama (Tips&Tricks), or download my example file.
- Load the file in Photoshop.
- Change the Image Size. Set width to the same size as heigth (uncheck 'Constrain Proporties') to create a 1:1 square. (example file: change 8000x2000 into 2000x2000 pixels).
- Rotate the image 180 degrees.
- Use the 'Polar Coordinates' filter (Rectangular to Polar) to create the planet.
And now you'll understand where the Polar Coordinates filter is meant for ;-)
Note: if you skip the rotation of 180 degrees you'll get the Wheel Shaped Amazing Circle (on the right).