By Design with Daniel on youtube.com
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In this step you'll learn about the different color modes available in Illustrator. Grayscale mode uses black and white to generate various tones of grey. RGB mode allows us to select very bright colors, but these colors cannot be printed. HSB mode stands for Hue, Saturation, and Brightness and uses a circular model known as the Color Wheel. Finally, CMYK mode stands for Cyan, Magenta, Yellow, and Key and is used to generate a range of colors for printing."