Custom emaps - how to?

Yuum,
Here a tip from @BrianJ (But for WinPC)

  1. Load Your images in to Gimp or Darktable (or other image software) and save it as Openexr, HDR or HDRI
  2. But new use “Textures Panel”, create new “HDR Texture” load Your image file.
  3. Then follow Brians worklfow, so save as normal image.

Other tip