Yuum,
Here a tip from @BrianJ (But for WinPC)
- Load Your images in to Gimp or Darktable (or other image software) and save it as Openexr, HDR or HDRI
- But new use “Textures Panel”, create new “HDR Texture” load Your image file.
- Then follow Brians worklfow, so save as normal image.
Other tip