Gamma correction matters if images need to be displayed accurately on a computer screen. Gamma correction controls the brightness and contrast of an image, and in the opposite case the image may turn out too dark or bleached out. Gamma correction filter that is available in ImageConverter Plus can be controlled from the number 0.01 up to 7.0. You can manually control the image brightness depending on your needs and depending on the image quality. Varying the amount of gamma correction changes not only the brightness, but also the ratios of red to green to blue.