There are thousands of sites devoted to art, graphics and pictures. Color is represented by adding red, blue, and green light. Current TV is a low resolution device with about 300 columns and 200 lines. Note that when text is presented on a TV screen you almost never see more than 20 characters in a line. If they tried to present 80 characters, all you would see is a blur.
TV looks realistic because it is an analog device which displays millions of colors.
To digitize a TV picture the signal is sampled at twice the frequency humans can discriminate, which is about 5 million cycles per second, and the colors represented by a 24 bit word. The resulting raw digital signal varies from 90 million bits to 220 million depending on the standard. The digital signal is converted back to analog for viewing, a process which functions to smooth out the discrete digital points. The US to leapfrog the competition has organized a competition between major firms. The final standard is likely to be digital and will come on line in the next twenty years.