Resolution-dependent: Images become pixelated when enlarged.
Good for: Photos, digital artwork and web graphics.
Resolution independent: Image size can increase without losing resolution.
Good for: Logos, icons and type.
Image Color Formats
CMYK is optimized for physical printing. It is a 4-color printing process that stands for Cyan, Magenta, Yellow and Key (black).
RGB is optimized for screen viewing. it is a light-based color model that stands for Red, Green and Blue.