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The main fix for the green shift towards yellow is an increase in R-Y gain, which should be done as a linear matrix in the camera, as PAL and HDTV do. Unfortunately NTSC never standardized the new green and set makers each applied a demod change of their own choosing. While this fixed skin tones, it resulted in overdriving reds due to the nonlinear CRT gun current vs voltage.
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Old TV literature, New York World's Fair, and other miscellany
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