There are three primary building blocks of standard symbols in ArcGIS—fonts, colors, and graphic files. In a previous article, we discussed fonts in ArcGIS symbols, and in an upcoming article we will tackle the issue of graphic files. In this article, we discuss colors in ArcGIS symbols, including color models and how they are used to define colors in ArcGIS, and the differences between their color gamuts. We wrap up with a set of tips for working with color in ArcGIS.
The first thing to understand about colors in ArcGIS symbols is that they are defined using a color model, which is a system for specifying colors numerically according to their individual components. A color model is visualized as a three-dimensional space that contains all possible combinations of the model’s primary colors.
Via Elpidio I F Filho