Filmmaker [Titus Kaphar] has many reasons to smile. The premiere for "Exhibiting Forgiveness" attracted attendees such as Serena Williams and Oprah Winfrey. The visually sumptuous movie examines what it takes to pardon wrongdoing. Famously, Mr. Kaphar was in his mid-20s when he decided to become an artist. The spark? An art history class in junior college. Mr. Kaphar taught himself how to paint by visiting art museums. In 2001, he completed an MFA degree at Yale. He was awarded the "genius grant" in 2018. Yet for all the artist's success, he was secretly having panic-attack nightmares about his father. "The thing that was the revelation is that my father is not the villain of my narrative," says Mr. Kaphar, who'd left home to live with relatives in California after witnessing his father commit a "heinous" act. While completing the script, Mr. Kaphar started writing and thinking from the perspective of La'Ron, the father. Mr. Kaphar realized that there are very few true villains in this world. "I began to realize that my father is as much a victim as I was. My father suffered at the hands of his father and, in fact, did better than his father," he says. "That was difficult for me to accept initially. But by the time I got finished, it was just clear. It was absolutely clear. It meant that I have developed a new compassion and sympathy for my father." Like his proxy character in the movie, Mr. Kaphar has let go of resentment toward his father. It had a healing effect. "Since the film, I haven't had any more of those nightmares," says Mr. Kaphar. "I haven't had one for almost two years now.