The Art Gallery at the Quogue Library is presenting “50 Shades of White,” a juried photography show that celebrates the beauty of white in all its permutations. On view through Feb. 26, the photographs, by 23 East End photographers, will be judged by Neil Watson, director of the Long Island Museum and formerly director of the Katonah Museum of Art in Westchester County. “Supernature,” an exhibition of paintings by Jeff Muhs, will open today at the Lyons Wier Gallery in Chelsea and continue through Feb. 25. A reception will be held tonight from 6 to 8.