NG
The cameras were composited with the graphics up-stream of the vision mixer - so when you cut to a camera on the vision mixer, it already had the graphic elements composited in.
There were some clever keying techniques used. There were clever tri-level key signals used to force foreground, force background or 'use a CSO key'. This allowed you to have an area of permanent studio camera, an area of permanent graphic, and just a small area of CSO just where you needed it (say around a presenter's shoulder). Therefore only the bit of set in the precise area of overlap needed to generate a good key, and using much more complicated shapes than you would have with a simple CSO mask.
The Nine O'Clock News always impressed me the most - as the studio flat behind the presenters (apart from during the 1997 election I think) had a real blue and orange map behind them - but the blue area was the bit they needed to key off, whilst the yellow bit was always fully masked when an inset was keyed in).
For it's time it was a brilliant realisation using existing technology (analogue component laser disc players, chroma keyers, Charisma and a simple control system to lock them all together allowing some very clever sequences) - though in on-screen terms it was pretty cold and distancing, and the wide shots really were very OTT. (And when it went wrong - more often than not on Breakfast News - it went wrong stunningly! I remember a BCU of someone's eyes filling the little hole for the studio elements in the virtual wide shot)
noggin
Founding member
Always wondered how the inset graphics to the side of the presenters in the virtual look was achieved. It doesn't look superimposed directly over the camera output, and yet those pictures above show the swirly blue backdrop which doesn't look like it would be suitable for keying.
The cameras were composited with the graphics up-stream of the vision mixer - so when you cut to a camera on the vision mixer, it already had the graphic elements composited in.
There were some clever keying techniques used. There were clever tri-level key signals used to force foreground, force background or 'use a CSO key'. This allowed you to have an area of permanent studio camera, an area of permanent graphic, and just a small area of CSO just where you needed it (say around a presenter's shoulder). Therefore only the bit of set in the precise area of overlap needed to generate a good key, and using much more complicated shapes than you would have with a simple CSO mask.
The Nine O'Clock News always impressed me the most - as the studio flat behind the presenters (apart from during the 1997 election I think) had a real blue and orange map behind them - but the blue area was the bit they needed to key off, whilst the yellow bit was always fully masked when an inset was keyed in).
For it's time it was a brilliant realisation using existing technology (analogue component laser disc players, chroma keyers, Charisma and a simple control system to lock them all together allowing some very clever sequences) - though in on-screen terms it was pretty cold and distancing, and the wide shots really were very OTT. (And when it went wrong - more often than not on Breakfast News - it went wrong stunningly! I remember a BCU of someone's eyes filling the little hole for the studio elements in the virtual wide shot)