Bit Maps

Raster output devices, such as display screens, are made up of a number of picture elements, called pixels or pels. By setting the color of the pels, you can create an image on the screen. The screen image can be represented internally by a graphics object called a bit map. The bit map contains a number of bits that describe the appearance of each pel on the screen.

This chapter describes bit maps, their creation, uses, and functions. The following topics are related to information in this chapter:

• Presentation spaces and device contexts
  
• Coordinate spaces
  
• Color and mix modes
  
• Area primitives
  
• Paths