So, an RGB value indicates a specific color, but how do we connect this to a computer image? If we were to view an image on our computer and try to zoom in as much as we can, we would observe that as we zoom in deeper and deeper, the image will start breaking apart into increasingly discernible colored squares—these squares are called pixels, which are the smallest units of color on a computer display or in a digital image:

A set of different pixels arranged in a tabular format (rows and columns of pixels) makes up a computer image. Each pixel, in turn, is an RGB value; in other words, a pixel is a tuple of three integers. This means that a computer image is simply a two-dimensional array of tuples, whose sides correspond to the size of the image. For example, a 128 x 128 image has 128 rows and 128 columns of RGB tuples for its data.