What is power law in image processing?

In image processing, a power law transformation, also known as gamma correction, is a nonlinear adjustment applied to the pixel intensity values of an image. It enhances the contrast in images by applying a power-law function, where the output intensity is proportional to the input intensity raised to a certain exponent (gamma). This transformation allows for better visibility of details in both dark and bright regions by adjusting the image's overall brightness and contrast. Commonly, it is used to correct the luminance of images for display on different devices or to improve the appearance of images for analysis.