Chapter 2. Photoshop Color
This chapter consists of an introduction to color basics (color models, image modes, and blending modes), and also to Photoshop’s color management features.
Color basics
Pixels
The screen image in Photoshop is a bitmap, which is a geometric arrangement (mapping) of a layer of dots of different shades or colors on a rectangular grid. Each dot, called a pixel, represents a color or shade. By magnifying an area of an image, you can edit pixels individually 
. Every Photoshop image is a bitmap, whether it originates from a scan, from another application, or entirely within Photoshop using its painting and editing tools. (Don’t ...
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