Welcome to an interactive demonstration on color theory! Each of the large white circles represents a color you can edit, using your brush, whose color is represented by the circle in the bottom left corner. You can use the sliders to change the color of your brush. The blue button with the pound sign (#) can be clicked to set the brush to a specific color. The button above it shows the mode of the brush. It can be in brush mode, where it adds color to colors you click on, eyedropper mode, where its color becomes whatever color you click on, or erase mode, where you it erases colors.
Colors are stored in this format: ([cyan],[magenta],[yellow]). Colors can be anywhere from (0,0,0) to (255,255,255), which are black and white, respectively.