Ah excellent, thanks so much for this.
So most TV transfers were created earlier, before blu ray and usually were straight scans, with few or no deliberate changes.
Would I be right in assuming that when it comes to both modern films and less prestigious films, the blu and the TV version would usually share the same master?
I mean, the last Harry Potter film was released onto blu ray shortly after it finished in the cinema. There the TV and Blu would share a common transfer. However the first Harry Potter film, released when VHS was still around, may have had a HDTV transfer, then when it came to Blu years later, a new version may have been created?
And less prestigious titles. For something big like Ghostbusters, I imagine there might be a few transfers. But for more obscure films like Grosse Pointe Blank, Wings of a Dove or Bound (great films, but not massively popular or lucrative) they probably only scanned them once and would have no reason to pay for another.