1. A method implemented by a computing system having a processor for selectively applying graphical filtering to a character, the method comprising: accessing a character to be rendered; identifying a limited portion of the character consisting of a particular typographical characteristic; identifying an observer characteristic which identifies whether the observer has dichromatic vision; selecting at least one filter designed to compensate for dichromatic vision; applying the at least one filter to at least the limited portion of the character, and applying one or more other filters to one or more other typographical characteristics while refraining from applying at least one of the other filters to the entire character of the accessed character; and displaying the character after applying the filters to the character.