A spot color is a color that is printed with a specific ink instead of C, M, Y, and K.
RGB color model is the industry standard of a kind of color, is based on red (R), green (G), blue (B) the change of the three color channels and their superposition between each other to get all sorts of color, RGB is on behalf of the red, green, blue three channels of color, this standard includes almost all the colors of the senses by human vision, is one of the most widely used color system.
