Definition: HSLRSWI refers to a system used for color mixing in photography. It was introduced by a man named John Schallart, who created a series of apps that allow users to mix colors using just their fingers. The acronym HSLRSWI stands for Hue (red), Lightness (blue), Saturation (green), and Brightness (white). These terms help photographers understand how different parts of the color spectrum are mixed together to create an overall image.