What is grayscale again? In daily life, a point on an LCD screen that we see with the naked eye, that is, a pixel, is composed of three sub-pixels: red, green, and blue (RGB). The light source behind each sub-pixel can show different brightness levels. The gray scale represents different levels of brightness from the darkest to the brightest. The more intermediate levels there are, the more delicate the picture effect can be. Taking an 8-bit panel as an example, it can represent 2 to the power of 8, which is equal to 256 brightness levels, we call it 256 gray levels. Each pixel on the LCD screen is combined by red, green, and blue with different brightness levels to form different color points. In other words, the color change of each point on the screen is actually caused by the grayscale changes of the three RGB sub-pixels that make up this point.
The common grayscale is shown in the figure: