What is the display gamma value?

The gamma value is just an output, representing a diagonal line between the image output value and the input value. (sometimes also used to describe the contrast of the screen)

In simple terms, the gamma value is not the higher the better or the lower the better, the main output is to adjust to the appropriate needs of the value.

Gamma value refers to the relationship between the input value and the brightness of the display output when printing technology or image processing, which affects the tonal distribution between the quadrochromatic's high light and darkened tone. Without color management, the user can adjust the gamma value of the display to simulate the viewing condition when comparing the contrast of the image on the display with the original. When using color matching software, the system specifically specifies the gamma value of the display.

The gamma value affects the tonal or intermediate level of grayscale in the middle of the graphic. By adjusting the gamma value, you can change the brightness value of the middle tonal grayscale of the image to increase the middle level of the image without having much effect on the level of the dark and light parts. Entering a larger number will enlarge the range of midtones, which makes the image with a large proportion of midtones produce smaller contrast and more detail.

Gamma value refers to the processing of a bitmap of a special effect adjustment, check the brightness of the photo is also very important, by comparing with the original photo, to see whether the photo is too dark or too bright, too dark or too bright can not get the ideal picture. It is easy to adjust the gamma value by brightening a photo that is too dark, but doing so will cause the photo to lose information.

To adjust the gamma value when scanning, the gamma value affects the tonal or intermediate level grayscale of the graphic intermediate value. By adjusting the gamma value, you can change the brightness value of the middle tonal grayscale of the image to increase the middle level of the image without having much effect on the level of the dark and light parts. Entering a larger number will enlarge the range of midtones, which makes the image with a large proportion of midtones produce smaller contrast and more detail. Entering a smaller number will reduce the range of midtones, which will increase the contrast of the image and reduce the detail of the image. When the curve moves downward, the corresponding pixel of the image darkens, and when it moves up, the pixel lightens. Its adjustment often needs to be combined with brightness and contrast to achieve satisfactory results.

The following three images are the result of three gamma values modeled by PS:

Gamma Value-Low

Computer knowledge

Gamma Value-Normal

Gamma Value-High