These colors are green, orange, and purple. The next category is secondary colors, which are formed by mixing the primary colors. There are three primary colors, red, blue, and yellow. These are the colors or pigments from which all other colors are derived. First, the wheel is broken into the primary colors. In traditional color theory, there are three categories of color based on the color wheel. While a multitude of variations exist today, Sir Isaac Newton created the first circular diagram of colors in 1666. Choosing the right color scheme could perhaps make a huge difference in the ultimate appearance of your design, but how do you know which colors to choose when you create your own logo? Well, color harmony is a major factor for you to consider, and this quick introduction will make it easy to understand. No doubt most of us can agree that color is a key component of logo design.