This is a question I answer on the regular. What is the difference between RGB and CMYK? And what the heck does it mean? RGB (red, green, blue) color is meant for the web; these colors are written using light on screen. Colors often appear very vibrant, saturated and bright in RGB. CMYK (cyan, magenta, yellow and black) is built color on paper using 4 colors of ink. Color in CMYK tends to be a bit lighter and less vivid, despite what we might see on the monitor.