Basic imaging concepts

A pixel (picture-element) is a minute area of illumination on a display screen. Many pixels can be put together to make a digital image.

Resolution is a measure of the number of pixels in an image. It is may be quoted as

• the width and height of the image, measured in pixels
• the total number of pixels in the image
• the total number of pixels per unit in the image.

For example, an image that is 2048 pixels wide and 1536 pixels high (2048 X 1536) contains (multiply) 3,145,728 pixels (or 3.1 Megapixels)