Grayscale
Grayscale is the so-called color or gray scale, refers to the brightness of the degree of shade. For digitized display technology, grayscale is the determining factor in the number of colors. In general, the higher the grayscale, the richer the color is, the more delicate the picture, the more detailed the rich details.
The grayscale level depends primarily on the A / D conversion bits of the system. Of course, the system's video processing chip, memory and transmission system should provide the corresponding number of support. At present, the domestic LED display mainly uses 8-bit processing system, that is, 256 (28) level gray. Simple understanding is from black to white a total of 256 kinds of brightness changes. RGB primary colors can be used to form 256 × 256 × 256 = 16777216 kinds of colors. That is commonly referred to as 16 megapixel. International brand display mainly uses 10-bit processing system, that is 1024-level gray, RGB three primary colors can constitute 1.07 billion color.
Although gray is the deciding factor in determining the number of colors, it is not to say that the greater the better. Because the first person's eye resolution is limited, and then increase the system processing bit number will involve the system video processing, storage, transmission, scanning and other aspects of the changes, the cost surge, cost-effective but decreased. Generally speaking, civil or commercial grade products can use 8-bit system, broadcast products can be used 10-bit system.
Brightness discrimination level
Brightness discrimination level refers to the human eye can distinguish the image from the darkest to the white between the brightness level. The gray level of the display mentioned above is very high, can reach 256 or even 1024 levels. However, due to the sensitivity of the human eye to brightness is limited, and can not fully recognize the gray level. That is to say that many adjacent levels of gray-scale people may look the same. And the ability to distinguish eyes each person is different. For the display, the human eye recognition level is naturally the better, because the display of the image, after all, is to see people. The greater the brightness level that the human eye can distinguish, the greater the color space of the display, and the greater the potential for rich colors. Brightness discrimination level can be used to test the software, the general display can reach more than 20 even if the better level.