Readability is becoming more difficult as computers get smaller and screens go to handheld.
Subpixel rendering is a way to increase the apparent resolution on a computer screen. The physical property of a pixel is composed of red, green and blue which are components that appear as a single color to the human eye. Using the relation between human eye and computer rendering can increase readability through the study of subpixels.
Subpixel rendering is extremely useful in creating readable favicons. A favicon (short for favorites icon) is a website icon,16×16 pixel square.
Type designers are now creating subpixel fonts that are super small, 3 pixel x-height. A machine or program cannot do this, it must be made buy hand taking a screenshot, enlarging it and studying the colorful world of subpixels.