Attributes of Bitmapped Images

Dimensions (resolution)

• 640x480 pixels is VGA standard full screen
  
  (a pixel is a single dot of color on the computer screen)

• 800x600 and 1024x728 and others now common screen sizes
  

Color Depth

• 4 bits (16 colors)
  
• 8 bits (256 colors)
  
• 24 bits (16 million colors - true color)
  
  

Compression

• none
  
• RLE (run length encoding)
  
• JPEG and GIF (lossy and lossless)

File Format

• Windows BMP
  
• JPG (Internet)
  
• GIF (Internet , originally Compuserve)
  
• PCX, TGA, and on and on and on