 Editing the zenith and nadir of panoramas
Often the zenith (top) and nadir (bottom) of equirectangular (spherical/cubic) panoramas require editing. However, these are the most difficult areas to edit in an equirectangular panorama as they are the highly distorted top and bottom of the image.
PTMac includes a utility to convert an equirectangular image into the six faces of a cube that can be edited in Photoshop or MacGimp. After editing, you can re-assemble the images using CubicConverter or Apple's free MakeCubic. A step-by-step description of this process is given below.
Note: CubicConverter from ClickHere Design includes an excellent method that makes editing even easier. After converting an equirectangular image to cube faces in CubicConverter, you can drag any cube face out of CubicConverter, edit then drag back in to CubicConverter.
Using PTMac to extract six faces of a cube
Click the PSphere2Cube in PTMac's Utility tab. This will bring up the following window.
The autosize checkbox creates cube faces that are one the width of source image divided by 3.14 (pi). Here is our input panorama:
Here is the resulting bottom cube face:
Here is the same face after using the clone stamp in Photoshop. Do not re-touch the edges of the image or your final panorama will show a seam between the re-touched face and the adjoining face.
You can now re-assemble the cube faces into an equirectangular image to make a cubic QTVR using CubicConverter or MakeCubic.
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