Photoshop, Blender, Meshmixer, S3D to add the frame and sliced in Cura 3.6
This is a smaller and lower detail version of the full lithophane, which is available on my website. https://www.gadunky.com/product/kratos/
Used a cool white backlight(6000k-8000k).
Full size vs smaller version.
Please note, it's easiest to slice this in Cura(or Slic3r and some other slicers). There are a couple of extra steps in S3D because of the way I designed this STL and frame. A bonus of this is there are some extra editing options available to you if you know what you are doing in S3D(connected meshes, cropping etc).
Check out more on my site: https://www.gadunky.com/