All images uploaded to Virtual Event Bags must be in RGB mode instead of CMYK. CMYK and RGB are different kinds of color models. CMYK is often used in color printing and refers to the four inks used in color printing: cyan, magenta, yellow and key (black). CMYK is often used in printing from both a household printer or a large digital printer. RGB stands for Red Blue Green and is often used on the web, digital media and computer displays.