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Sensitivity, also known as ISO, refers to the camera's sensitivity to light. The higher the ISO value, the higher the sensitivity, and the brighter the photo will be, and vice versa. However, too high an ISO value will also increase the noise in the photo. Sensitivity, also known as ISO value, is a measure of the sensitivity of the film to light. It is determined by sensitometry and measuring several values. It has recently been standardized by the International Organization for Standardization. For less sensitive films, longer exposure times are required to achieve the same image as more sensitive films, so they are often called slow films. Highly sensitive films are therefore called fast films. Whether digital or film photography, in order to reduce exposure time, using a relatively high sensitivity usually results in reduced image quality (due to coarser film grain or higher image noise or other factors).