Photoshop/101basics/managingcolors/imagemode

=> Photoshop Tutorials => Photoshop 101 - The Basics => Photoshop Colors Basics => Image Mode

Image Mode

RGB Color mode : Where colors are there for a web purpose.

CMYK Color mode : Where colors are used for a printing purpose.

Lab Color Color mode : Where colors are based on human vision for colors.

Grayscale mode : Where colors are only a gradient of gray.

Bitmap mode : Where colors are either black or white.

Duotone mode : It is using only one color range for the image, this is used after transforming the color mode for grayscale. (for ink printing purposes)

Indexed Color mode : for producing 8-bit, 256-color files.