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Color information is stored using the YCbCr color space (different from NTSC that used YIQ) with 4:2:2 sampling (also different from NTSC) and following Rec. 601 colorimetry. 480i can be transported by all major digital television formats (ATSC, DVB and ISDB) and on DVD.
In 4:2:0, the horizontal sampling is doubled compared to 4:1:1, but as the Cb and Cr channels are only sampled on each alternate line in this scheme, the vertical resolution is halved. The data rate is thus the same. This fits reasonably well with the PAL color encoding system, since this has only half the vertical chrominance resolution of NTSC.
Following the final sample number 719, samples numbered 720 through 857 contain the horizontal blanking, color burst, and so forth. The entire 720 samples are active content, zero of those samples are for blanking or "nominal blanking" or any other non-picture-sampling purpose.
SDTV resolution by nation: for historical reasons, different countries use either 480i or 576i as their standard-definition picture format. Standard-definition television (SDTV; also standard definition or SD) is a television system that uses a resolution that is not considered to be either high or enhanced definition. [1]
For a color TV to recover hue information from the color subcarrier, it must have a zero-phase reference to replace the previously suppressed carrier. The NTSC signal includes a short sample of this reference signal, known as the colorburst, located on the back porch of each horizontal synchronization pulse. The color burst consists of a ...
Test cards typically contain a set of patterns to enable television cameras and receivers to be adjusted to show the picture correctly (see SMPTE color bars).Most modern test cards include a set of calibrated color bars which will produce a characteristic pattern of "dot landings" on a vectorscope, allowing chroma and tint to be precisely adjusted between generations of videotape or network feeds.
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4:2:0 and 4:1:0 sampling The provided information is not correct. The numbers in x:y:z don't indicate which horizontal lines contain which chroma samples. 4:2:0 does not mean that there is no V or Cr information stored at all, it means that in each line, only one color difference channel is stored with half the horizontal resolution.