Gamma value and brightness are two parameters that play different roles in image processing and display technology, and there is a clear difference between them.
Gamma value
Gamma value is an important parameter closely related to display and image processing, which is used to describe the relationship between brightness and input signal. In most display devices, the Gamma value is generally set to 2.2, which means that the relationship between the brightness output by the device and the input voltage is not a simple linear relationship, but presents the characteristics of a power function. Specifically, the Gamma value determines the brightness and contrast of the image output by the display device, affecting the visual performance of the image.
Function: Gamma value is mainly used to adjust the bright and dark details of the image, as well as the overall contrast and color tendency. When the Gamma value is high, the bright details of the image will increase and the dark details will decrease, making the image look more vivid; conversely, when the Gamma value is low, the dark details of the image will increase and the bright details will decrease, making the image look softer.
Impact: Gamma value has a significant impact on the brightness, contrast, color and details of the image. Correct Gamma value settings can make images more realistic, natural, and more accurate in color; incorrect settings may cause image distortion and poor viewing experience.
Brightness
Brightness refers to the brightness value of pixels in an image, which can also be called grayscale value. It represents the ratio of the light intensity of a light source to the area of the light source, that is, the luminous intensity per unit projection area. In image processing, brightness is used to adjust the overall brightness of an image.
Unit: The unit of brightness is candela/square meter (cd/m²) or nit (nit, 1nit=1cd/m²).
Function: By adjusting the brightness, the overall brightness of the image can be changed to make it more in line with the needs of the viewer or adapt to different viewing environments.
Note: It should be noted that too high brightness may make the image appear too dazzling or even cause damage to the eyes; while too low brightness may make it difficult to distinguish image details. Therefore, it is necessary to find a suitable balance when adjusting the brightness.
Summary
In summary, Gamma value and brightness play different roles in image processing and display technology. Gamma value is mainly used to adjust the details of the bright and dark parts of the image, as well as the overall contrast and color tendency; while brightness is used to adjust the overall brightness and darkness of the image.
Although both are related to the visual performance of the image, their modes of action and scope of influence are different. In practical applications, it is necessary to reasonably set the Gamma value and brightness according to specific needs and viewing environment to obtain the best visual experience.