Have you ever encounter this experience? When you were touching up an dusk or sunset image, or image with gradient lights, you can easily find color discontinuation on the screen. The reason of this phenomena might be using a compressed file format (such as JPEG) for touchup, or might be due to the color bit-depth of the monitor. In a simple term, color bit-depth refers to the maximum number of colors that a device can display. The larger color bit-depth allows the monitor to display richer colors, and the color transition and gradient performance will also be more natural and continuous. From previous article, we learned that the image we see on the monitor are composed of densely packed “dots” (pixels), and each dot is composed of the three primary colors R, G and B. For most consumer monitors nowadays, they all have the basic color bit-depth of 8 bit, which means that there is 2 to the power of 8 (2^8) of each R, G and B colors; this means that the monitor can produce a total of 16.77 million colors.