what are Pixels ?

Pixel or a Picture Element can be interpreted as a dot on the screen. Actually , it is the code for the color to be shown at a particular discrete ( with x, y position ) co-ordinates on the screen. Bitmaps or Pixmaps ( in Linux Parlance ) stores the information regarding the color of an image as sequence of bytes. I have blogged about this here in the past..! . In that particular page there is a code snippet which shows how one can store pixel values.