Tips and Tricks

A digital photois a computer file usually created by a digital camera or a scanner, which contains sets of numbers that specify the colors of a rectangular grid of pixels. A digital photo is invisible unless it is displayed (e.g. on a computer screen or via a projector) or printed.

A pixel is a picture element – one of the small squares (or rectangles) that makes up a digital photo on the computer.  In context of digital imaging, a pixel is a single point/dot in a raster image. In other words, a pixel is the smallest addressable screen element. It is the smallest unit of a picture that can be controlled. Each pixel has its own “address”. The “address” of a pixel corresponds to its coordinates in a 2-dimensional grid, and are often represented using dots or squares.  The intensity of each pixel is variable. In color imaging systems, a color is typically represented by three or four component intensities such as Red, Green and Blue (RGB system), or Cyan, Magenta, Yellow and Black (CMYK system).