Red, Green, Blue (RGB) This color mode produces images on a screen, made of pixels. Each color can be represented as a number between 0-255. A color made in RGB is considered an additive color. Additive meaning that you start with no color (a blank screen) and add color to produce light. When all three are added together (255, 255, 255) it produces white. This color mode is used for screen, for example, your TV, Computer, and phone. RGB is the ideal color mode for any design to be used on screen.
When using RGB remember LIGHT ON A SCREEN
Cyan, Magenta, Yellow, Black, also known as Key color (CMYK) This color mode is produced using ink and is known as subtractive color. Colors made in CMYK are represented by a combination of numbers. Each individual color of CMYK is assigned a number between 0-100. For example, if you wanted 100% black the combination would be (0,0,0,100). CMYK is the preferred color mode when designing items to print, i.e., books, cards, magazines, etc.
When using CMYK remember INK ON A PAGE.