Luminais was born in Nantes into a parliamentary and legal family. His great-grandfather Michel Luminais was an official in the Vendée; his grandfather Michel-Pierre Luminais represented the Vendée in parliament from 1799 to 1803; and his father, René Marie Luminais, represented Loire-Inférieure from 1831 to 1834 and Indre-et-Loire from 1848 to 1849. Aware of his natural artistic talent, his family sent him to Paris when he was 18 to study with the painter and sculptor Auguste Debay. He also studied with Léon Cogniet, a historical and portrait painter whose pupils included Léon Bonnat, and Constant Troyon, who painted landscapes and animals.