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Conversion to and from HDR (tone mapping)

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Please post guides for converting files to and from the HDR (High-dynamic-range) to previous standards, BR or DVD.
https://en.wikipedia.org/wiki/High-dynamic-range_imaging
https://en.wikipedia.org/wiki/Tone_mapping

This will aid in the comparisons currently underway for the 2019 versions as people look to uncover changes.

Determine if all the films used the same methodology when converted; or if like color correction, certain films were approached one way while others differently (OT vs PT for example) or if a selective scene by scene approached was used by the current ownership of the SW properties.

Some examples from online:
Put HDR effect in your VIDEO | Using After effects | no plugin: https://www.youtube.com/watch?v=6suDfAc8I1c
Fake HDR Video Tutorial: https://www.youtube.com/watch?v=z_1cEl_8apE
Simulating an HDR Effect in Photoshop: https://www.youtube.com/watch?v=ywDg4mDBiLc

A general path to HDR:

  1. Duplicate image/video as new layer
  2. Apply Hue/Saturation - Increase Saturation 40% - 50%
  3. Apply Invert to same layer
  4. Apply Gaussian Blur to same layer - ?%
  5. Change this layer to an ‘Overlay’ blending method

Talk about other workflows with different applications/operating systems.