Quote:
Originally Posted by Joel Cairo
As I mentioned in another thread, due to the technical nature of how color is encoded in PAL vs. NTSC, as well as differences in how the respective telerecordings for each format are created, Richard Russell's astounding program will not work with NTSC material. In order to develop a similar process for NTSC, it would be necessary (at a minimum) to re-create the original color burst signal of the kinescoped program, which is not feasible at this point in time.
- Kevin
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If there's an area of the picture with a constant color (in a scene, like sky) one could infer a burst. It would have to be done by hand to adjust the tint at least for every scene. Adjust until you get the faces right. Labor intensive.
Another complication for NTSC is if the CRT display in the kinescope has some horizontal nonlinearity. Which would look like a gradual shift in tint if you demodulated the photographed chroma subcarrier. But one could model such nonlinearity in the decoder program if there's say a title screen of some constant color at the beginning or end of the show. PAL is more tolerant of such phase errors, as the phasing flips from line to line. SECAM material should be immune to this, SECAM may be the easiest to recover the color here. Oh, no burst to tell U from V, but just shift the line alternation of the decoder if the colors come out weird.
Of course this is dependent on someone running the kinescope capture process not bothering to filter out the chroma subcarrier. Probably using equipment built before color TV was installed elsewhere in the station. "Oh, we'll just low pass filter the film to video converter later.".