Editing Kinescope (section)

=== Stored field ===

A successful improvement on the suppressed field system was to display the image from one of the fields at a much higher intensity on the television screen during the time when the film gate was closed, and then capture the image as the second field was being displayed. By adjusting the intensity of the first field, it was possible to arrange it so that the luminosity of the phosphor had decayed to exactly match that of the second field, so that the two appeared to be at the same level and the film camera captured both.

Another technique developed by the [[BBC]], known as ''spot wobble'', involved the addition of an extremely high frequency but low voltage sine wave to the vertical deflection plate of the television screen, which changed the moving 'spot' - a circular beam of electrons by which the television picture was displayed - into an elongated oval. While this made the image slightly blurred, it removed the visible line structure (by causing adjacent lines to touch, so that no separating band of darkness lay between them) and thereby resulted in a better image. It also prevented [[moiré pattern]] from appearing when the resulting film was re-broadcast on television, which occurred if the line structure on the film recording did not precisely match the scanning lines of the electronic film scanner.