Abandoning his liberal arts education to begin painting, he studied with Carlo Marco, who had arrived in Florence during the 1830s.
[1] Gelati expressed an early interest in landscapes and genre scenes.
He briefly participated in the activities of the Scuola di Staggia [it], a group devoted to painting realistic landscapes in plein aire, which included his teacher's sons Carlo Marco, the Younger and Andrea Marco.
Although he never joined their movement, he was in accord with their use of color as it related to areas of light and shadow.
The scope of his work was often not appreciated as, after his death, many of his paintings—apparently unsigned—were attributed to artists such as Giuseppe Abbati, Raffaello Sernesi and Odoardo Borrani.