This episode outlines the fundamental principles of digital image representation, focusing on bitmap graphics. It explains that images are composed of individual pixels, each represented by a binary value that dictates its color. The document clarifies that the number of bits per pixel directly impacts the available color range, often referred to as color depth. Furthermore, it details how image resolution, defined by pixel concentration, and color depth influence file size. Finally, the text introduces the concept of image metadata, which stores crucial information about an image beyond its pixel data, such as resolution and creation details.