A video system for assessing colour corrections required prior to printing a motion picture negative. Analysers are used toa film and record the exposure adjustments.
These machines are essentially a closed circuit colour television system that produce a positive image on the monitor screen. Later versions are digital and therefore more accurate. Separate controls allow the gain on the RGB channels to be individually adjusted in calibrated steps (equal to one 'light’) that match the printer’s light output.
After grading, the stored adjustments required for the printer are punched out on a 1” paper tape. These RGB light valves.tapes control the printer
Many new analysers contain a digital frame store with split screen display. This function allows the operator to recall the image from stored memory for comparison to the film being analysed to assure continunity of colour judgement.