The Hudson Valley has lured generations of African American artists from New York City, looking for the kind of space that inspired the Hudson River School of painters. Most notably among them are exhibited here today David Hammons, sculptors Martin Puryear and Colin Chase, Deborah Priestly and abstract painter Peter Bradley.   TRANSART’s mission is to gather these and other artists in the area into community, prove continuity, context, exhibition space and inspiration to anchor the revitalization of the larger community of color in the Hudson Valley.