Quote:
Originally Posted by ppppenguin
Mean level AGC, especially with AC coupling, was often known as Always Grey Control.
At the studio end, it was the job of the racks engineers to keep black level where it should be. Working an Emitron/Iconoscope camera was a difficult job. Not only black level but also tilt and bend to correct for brightness distortions within the picture.
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"Always grey control" - love it!
If you google "TV shader job" Google leads to "camera shading jobs" and "studio video technician," so the term "shader" has been a sticky one, it seems, even though no one has done that instantaneous manual correction for a long time now.