This is three sprites, each with thin slices of an image. They are all based on the same photo, but each of them have been modified so that only image data from one channel (red, green or blue) is shown. If all three sprites have full brightness and are aligned, all the colors in the original photo will appear. This is how monitors display colors. ☛Play around with the sliders and see what happens. ☛Click the screen to show/hide the sliders.
Photo by guy stevens on Unsplash: https://unsplash.com/@gstevens0884