Lets talk about how a digital image is compsed. First, The word pixel is based on a contraction of two sufixes, pix (“pictures”) and el (for “element”). A pixel is considered the smallest part of a digital image, a single point in a graphic image. Graphics monitors display pictures by dividing the display screen into thousands (or millions) of pixels, arranged in rows and columns. The pixels are so close together that they appear connected.
Now, note that in the video, all colors on the monitor are represented by 3 dots: red, green, blue (RGB). The various colors in an image are accomplished by illuminating these dots in a specified ratio. If you want WHITE, all 3 color dots are brightly illuminated the same amount. Colors other than white are created by illuminating one or two of the dots more than the other(s). To create a BLACK portion of an image, all 3 colors are turned OFF in that area.