All HDRIs are licensed as CC0.

These were created by Greg Zaal (Poly Haven https://polyhaven.com).
Originals used for each HDRI:
- City: https://polyhaven.com/a/portland_landing_pad
- Courtyard: https://polyhaven.com/a/courtyard
- Forest: https://polyhaven.com/a/ninomaru_teien
- Interior: https://polyhaven.com/a/hotel_room
- Night: Probably https://polyhaven.com/a/moonless_golf
- Studio: Probably https://polyhaven.com/a/studio_small_01
- Sunrise: https://polyhaven.com/a/spruit_sunrise
- Sunset: https://polyhaven.com/a/venice_sunset

1K resolution of each was taken, and compressed with oiiotool:
oiiotool input.exr --ch R,G,B -d float --compression dwab:300 --clamp:min=0.0:max=32000.0 -o output.exr