Adding a nadir cap (mirror ball)
I wrote a Photoshop action that produces these mirror spheres below out from an equirectangular panorama. As you can see are three sizes available.
Small covers 5% ,Big 8% and XXL 12% of panorama height (equirectangular projection) Below you can see the region that will be covered with the mirrorball.
Here the action set in Photoshop:
Download the Photoshop action here: Media:cap.atn
A similar action with text: Media:cap_text.atn
For a flexible nadir cap which can be streched to your needs: Media:CapFlex.atn
Don't know how to install a Photoshop action? Take a look at How to install actions in Photoshop
Worklflow 1.) Open equirectangular / psphere image in Photoshop 2.) Run desired action (small / big / xxl)) 3.) Save as.... 4.) Finished
Peter Nyfeler (Pitdavos)