Submodule 15.2: The RGBAs of image

The RGB color model is a model in which red, green and blue light are added together in various ways to reproduce other colors. Its name results from the combination of the initials of the three additive primary colors, red, green, and blue. The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems, such as televisions and computers.

For more information: https://www.w3schools.com/colors/colors_rgb.asp