We will cover sampling rate, digital resolution, and what bits have to do with video. I fear that some of this might just get too complicated, but I promise to drop back to the basics next month. A definition of digital video can be related to analog video. If all other factors are ruled out, analog video has infinite resolution and infinite signal clarity. Digital video is automatically limited in its resolution by definition.
Digital video is generated by taking limited samples of analog video.
Two factors determine the resolution of digital pictures. The second is amplitude sampling or how many samples are taken between black and peak white. Digital Resolution Lets look at those two factors, one at a time. Amplitude sampling can be considered similar to using a ruler to measure a length. For example, let's assume that a video signal is 1 inch high, from black to white.