RGB

• Red, Green, Blue
• Light based, screen
• Additive color model
• Web

CMYK

• Cyan, Magenta, Yellow, Black
• aka “process” or “4-color”
• Subtractive color model
• Ink based
• Print

Grayscale

• 155 levels of black
• Print but can be turned into rgb for print
• Newspaper

Don’t switch back and forth – know what your final output will be