With a four tube camera, however, this registration problem is avoided because the transient edges in the luminance signal all originate from a single tube.
12.
The final colour picture was created by combining the chrominance and luminance signals, but the technicians simply switched off the colour tubes whilst this dispute took place.
13.
This signal could be successfully combined with the luminance signal from digitally-scanned existing broadcast-quality monochrome telerecordings to make new colour master copies, suitable for broadcast and sales.
14.
Because the color information was designed to be a cheap, backwards compatible addition to the monochrome signal, the color signal has a lower bandwidth than the luminance signal, and hence lower horizontal resolution.
15.
Dot crawl is most visible when the chrominance is transmitted with a high bandwidth, so that its spectrum reaches well into the band of frequencies used by the luminance signal in the composite video signal.
16.
If the gamma corrected luminance signal y ^ { \ frac { 1 } { \ gamma } } is simply used instead of y'then colour errors result which can be appreciable for saturated colours.
17.
The following illustration shows the difference between a scale with linearly-increasing encoded luminance signal ( linear gamma-compressed luma input ) and a scale with linearly-increasing intensity scale ( linear luminance output ).
18.
In a monochrome receiver the luminance signal is amplified to drive the control grid in the electron gun of the CRT . This changes the intensity of the electron beam and therefore the brightness of the spot being scanned.
19.
Because the rendering of colors in this way is the goal of both black and white ( monochrome ) film and black and white ( monochrome ) television systems, the Y signal is ideal for transmission as the luminance signal.
20.
When testing with NTSC between November 1956 and April 1958, the colour subcarrier was 2.6578125 MHz with a'Q'bandwidth of 340 kHz ( matching the rolloff of the luminance signal at + 3.0 MHz ).
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