In zip file you find:
- One 4000x2000 32bit HDRI (.hdr) fully spherical map
- One 8000x4000 8bit LDR (.jpg) fully spherical map
- One 512x256 32bit HDRI (.hdr) light map
- 15 Backplate images (.jpg) containing a reference object for easier camera matching
- sIBL description file
What is sIBL?
It's a short for 'Smart IBL' . It's a standard describing all informations and files needeed to provide fast and easy Image Based Lighting Setup.
sIBL-Gui is a free application for organizing your HDR images and setting up your scenes with a single click.
But you are not required to use sIBL-GUI to use these files. You can also set up you scenes as usual.