HDR on regular Blu-ray - adding a datastream

[kfbkfb]

The 1st generally available 3D Blu-ray would play (in 2D)
on regular Blu-ray players (later 3D Blu-rays wouldn't), the
added datastream containing the 3D information was
ignored by regular Blu-ray players.

My idea is to add an HDR datastream to regular Blu-rays,
new Blu-ray players would decode it and add HDR to
regular Blu-ray images (since most UHD Blu-rays are
recorded with HDR, these masters could just be
downconverted to create HDR regular Blu-rays).

(if such an HDR datastream could be created, it might
also be possible to add HDR to ATSC 1.0 over the air HDTV)

Kirk Bayne