There are eight images available for adjustments because visual snow parameters may vary depending on the scene. It is recommended to select an image where the visual snow appears most stable. Even within the same image, the appearance of visual snow may change with the local background. In such cases, the parameters should be adjusted for the region where the visual snow is most stable. It is also interesting to observe whether adjustments made on one image transfer to others. When major differences occur, separate adjustments should be made for each image.