The Colby College Museum of Art will be the subject of a half-hour profile as part of the “Maine Art Museum Trail” series, an original production of the Maine Public Broadcasting Network. The program will air at 7:30 tonight on the TV stations of MPBN. The seventh and final installment in “The Maine Art Museum Trail” series, the new episode chronicles how, in a relatively short period of time, the Colby museum has grown to house several outstanding collections and become one of the best academic art museums in the country. The program goes through the museum’s four wings, each with its own spatial features that provide advantages to displaying certain works of art. Paintings by Winslow Homer, a sculpture by Richard Serra, large-scale paintings by Alex Katz and two galleries dedicated to John Marin are featured in the program. The back-to-back rebroadcasts of each of the other six programs in the series will immediately follow the Colby episode.