Color-hex contains an exhaustive list of color names with associated codes for online usage, including RGB, CMYK and HEX codes for graphic and web designers. Wikipedia includes a similar list of colors, as well as articles about their names and histories.
Online color dictionaries with pre-defined color codes make it easier for computer programmers and designers to work together. Even so, people may disagree on the name of a particular color partly because people perceive color in different ways. Likewise, computer screens process and display colors in a different way so that the same color can appear radically different on any two monitors. Designers often calibrate their monitors when working together to ensure that the final product appears the same to both parties.