Red is the first of three primary colors in an additiveWhat is an additive color model? The RGB (red, green, blue) color model is additive. When these thre... More color modelA color model is a measurement system that numerically specifies the perceived attributes of color. More. The “R” in RGBWhat is RGB? RGB stands for Red, Green, and Blue. These are the colors of light. Monitors, TVs, and ... More.