Here again, there is a major difference between the way computers and television handle video. With this method, the screen is not broken into fields. Instead, the computer displays each line in sequence, from top to bottom. This entire frame is displayed 30 times every second. This second factor is a bit more complex.
Color resolution refers to the number of colors displayed on the screen at one time.
Since PC and Macintosh monitors generally have resolutions of 640 x 480 pixels, most people assume that this resolution is the video standard. As with RGB and YUV, there is no direct correlation between analog video resolutions and computer display resolutions. A standard analog video signal displays a full, over scanned image without the borders common to computer screens. Most countries endorse one or the other, but not both. Since the resolution between analog video and computers is different, conversion of analog video to digital video at times must take this into account.