256×256×256= 167772 16。 That is commonly known as160,000 colors or10,000,000 colors. Also known as 24-bit color (2 to the 24th power). All the colors on the computer screen are composed of red, green and blue light in different proportions. A group of red, green and blue is the smallest display unit. Any color on the screen can be recorded and expressed by a set of RGB values.

Extended data:

RGB format

The methods of coding colors are collectively called "color space" or "color gamut". In the simplest terms, the "color space" of any color in the world can be defined as a fixed number or variable.

RGB (red, green and blue) is just one of many color spaces. Using this coding method, each color can be represented by three variables-the intensity of red, green and blue. When recording and displaying color images, RGB is the most common scheme. However, it lacks good compatibility with the early black-and-white display system.

Therefore, many electronic appliance manufacturers generally adopt the practice of converting RGB to YUV color space to maintain compatibility, and then switching back to RGB format as needed to display color graphics on computer monitors.

Baidu encyclopedia -RGB