4 ms·
It has the NTSC Subcarrier of ~3.58Mhz, and that limits color resolution. Let's say you're displaying a 640x480 screen on a TV. Your chroma information is sam
by Dwedit 3y ago
It has the NTSC Subcarrier of ~3.58Mhz, and that limits color resolution.
Let's say you're displaying a 640x480 screen on a TV. Your chroma information is sampled from an area about 2.1 pixels wide. So even if the signal is continuous, your color information is the result of sampling a boxed area centered on that pixel.
And because you don't want the wave pattern to be displayed as luma, you also take the average luma of that area. Now you have a blurred fat color pixel, but it can be positioned anywhere continuously.
- epcoa 3y agoNTSC is just one specific implementation of analog color video transmission, has nothing to do with CRT functionality outside of North America/Japan/a few other places and generally when speaking about CRT monitors for computers, arcades and the like they operate on discrete RGB signals with a wide variety of timing: https://en.wikipedia.org/wiki/Coordinated_Video_Timings https://en.wikipedia.org/wiki/Coordinated_Video_Timings, NTSC isn't a thing. Furthermore, even when using NTSC video timings, the 3.58 MHz subcarrier is specific to transmission of composite video (carrying brightness and color combined in the same signal). A DVD player for instance with a component or SVideo output produces NTSC timing but there is no subcarrier because the color signal is discrete.