Vignetting (n.) A reduction in image brightness or saturation at the periphery compared to the center. In mobile photography, vignetting can occur naturally due to lens characteristics or be added intentionally as a creative effect. Some smartphone cameras automatically correct for unwanted vignetting, while many editing apps allow users to add or adjust vignettes. When used subtly, vignetting can draw attention to the center of an image or create a vintage look. Excessive vignetting, however, can be distracting or make an image appear artificially processed.
Vignetting
