The above image is actually composed of five equal width parts, with each part having a different color depth. You need a device capable of displaying 16-bit images in order to see the difference between all five parts. The left-most part has a color depth of 16 bits. Next to it is an 8-bit image, then a 4-bit image, followed by a 2-bit image, and finally a 1-bit image. Below is the whole image displayed using the current color depth.