This package contains functions that convert to and from different types of environment map representations. Most of the code was implemented following the book:

E. Reinhard, G. Ward, S. Pattanaik, and P. Debevec. High dynamic range imaging. Morgan Kaufman, 2005.

Please see the book for more details. The "sky angular" format is a convenient way to visualize the top hemisphere of the environment map only, with minimal distorsions. 

The world coordinates [dx,dy,dz] have the following reference frame:

       ^ y
       |
       |
       .----> x
      /
  z  v
  
The camera would be looking in the negative z direction.

** Note **

All functions assume that their inputs is in double format in the [0, 1] range. 
im2double should do the trick.

** History **

04/19/11: Fixed small but in envmapWorld2SkyAngular.m which prevented correct conversion from skyAngular to latlong format.