The sun was still shining when the 78th Cannes Film Festival came to an emotional, exhilarating close with the Palme d’Or going to “Un Simple Accident,” from the Iranian writer-director Jafar Panahi.

The announcement was met with cheers and a standing ovation in the Grand Lumière Theater. Accompanied by his actors, some who began weeping, an equally moved Panahi kept on his sunglasses as he accepted his award.

A longtime festival favorite, Panahi had until recently been barred from making movies in Iran or traveling outside the country. Although the restriction has been lifted, he shot “Un Simple Accident” clandestinely.

The movie tracks a group of men and women who join together after one of them kidnaps a man they believe tortured them in prison. Panahi, who has been imprisoned several times, drew his inspiration from stories he heard from other inmates while he was at Evin Prison in Tehran.

The Palme for Panahi capped what was widely seen as one of the strongest festivals in years. For some, the selections offered reassuring evidence that the art would continue to endure — and thrive — despite the problems facing the industry. Certainly, President Trump’s recent threat to institute a 100 percent tariff on movies made in “foreign lands” had cast a shadow over the opening ceremony. By the close of the festival, however, the bounty of good and great work had palpably buoyed spirits.

The Palme d’Or was decided upon by a nine-person jury led by the French actress Juliette Binoche. “My friends, this is the end — it was such a show,” she said, turning to her fellow jurists, who included the American actor Jeremy Strong and the Indian filmmaker Payal Kapadia. Given Binoche’s auteur-rich résumé, it is perhaps unsurprising that this jury gave a special award to the Chinese filmmaker Bi Gan for “Resurrection,” a delirious, elegiac journey through cinema history.