Initially, he was interested in replicating Herb Ritts’s popular image of a group of nude supermodels clustered together on the floor, and a Helmut Newton diptych of women clothed and then unclothed in the identical pose. Ms. MacAllister and some of her friends agreed to be his subjects. He then posed the women to simulate Matisse’s “Dance” and Marcel Duchamp’s “Nude Descending a Staircase.”

The responses have ranged from joy to horror. One formerly obese woman said the photos terrified her; she said they recalled a picture she kept in her wallet as a reminder of her former self. Other women have thanked Richard Michelson, the Northampton gallery owner, for displaying the images, and even asked if Mr. Nimoy wanted to photograph them.

“I am actually amazed at how little negative reaction there has been,” said Mr. Michelson. “I attribute this in part to the gallery setting, and the fact that Northampton, Massachusetts, is perhaps the most liberal city in the most liberal state in the nation.”

“We do overhear some reductive ‘Is Nimoy into fat chicks’ comments when the gallery room is first entered,” he continued, “but in fact the fun nature of the work and the quality seem to shut people up by the time they leave. I’ve had a few crank e-mails with snide remarks, but not a one from gallery visitors.”

The Big Fat Blog, a Web site devoted to fat acceptance, wrote about Mr. Nimoy’s photographs in 2005. A woman calling herself Nellicat wrote in response: “I’m 5’5" and weigh between 130 and 135. But I don’t feel as comfortable in my own skin as I should. I look at those women strutting, posing, laughing, and I feel real envy towards them. There they are, posing for a man (!) knowing that the whole world will be able to see them naked (!!) and they are LOVING it. Oh, to be that free! To be that comfortable and beautiful in your body — I truly envy them.”

Though most people think of performers as naturally more unabashed than the rest of us, Ms. MacAllister said it is sometimes difficult for them, too. “We get scared and struggle w/self-acceptance and self-love just like you,” she posted on the blog at the time. “Just want you to know that ‘freedom is not free’; the freedom you see us enjoying is the result of constant hard work and eternal vigilance against the ‘tyranny of slenderness.’ ”