Pixel and Resolution in Graphics


Each screen point is referred to as Pixel or Pel. A pixel may be defined as the smallest size object or colour spot that can be displayed on a monitor.
An image is displayed on the monitor is made up of thousands of these small pixels. The closely spaced pixels divide the image area into a compact and uniform two-dimensional grid of pixel lines and columns. Each pixel has a particular colour and brightness value. Though the size of a pixel depends mostly on the size of the electron beam within the CRT, they are too fine and close to each other to be perceptible by the human eye.


There are two types of resolution exists in Computer Graphics:

  • Image Resolution
  • Screen Resolution
  • Image Resolution:

    Image Resolution refers to the pixel spacing the distance from one pixel to the next pixel. In other words, the resolution of an image is the total number of pixels along with the entire height and width of the image.
    Example : A full-screen image with resolution 800×600 dpi means that there are 800 columns of dot pixels per inch and each column comprising 600 dot pixels per inch.
    A total of 800×600 = 48000 dot pixels in sq. inches image area.

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