Chromo therapy, also known as color therapy, is the practice of using certain colors to stimulate various emotions and to improve health, and it is something that many architects and designers have long recognized as having psychological benefits.

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NEW YORK — When Roberta Freymann moved into her apartment at the Apthorp on the Upper West Side three years ago, she knew her first order of business would be repainting the dull gray walls.

“The wrong paint color can ruin your life,” Freymann said. “Color affects the way you feel when you’re at home.”

Freymann, the woman behind the lifestyle brand Roberta Roller Rabbit, prefers bright paint colors — which she believes can boost productivity, creativity and positivity — over traditional neutrals and earth tones.

She painted her three-bedroom condo accordingly, using a fiery red-orange in the library to promote productivity, a soothing deep indigo in the guest bedroom and a Tiffany-blue in the dining room, which she says helps stimulate conversation at dinner parties, or at least gives bored guests “something interesting to look at.”

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“Color is uplifting,” Freymann said. “It improves your mood and, in turn, your quality of life at home.”

Chromo therapy, also known as color therapy, is the practice of using certain colors to stimulate various emotions and to improve health, and it is something that many architects and designers have long recognized as having psychological benefits.

“Architects, artists and designers have treated the ills of human societies with color since the shaping of environments began,” said Donald Kaufman, who owns the paint company Donald Kaufman Color with his wife, Taffy Dahl.

Some colors, in short, simply make people happy.

For the past 30 years, Kaufman and Dahl have made mixing such paint colors their business. Together they develop custom shades for their clients based not only on the architectural details of a space but also on their clients’ personalities.

“Wall paint influences us by its pigment composition, the colors and finishes with which it’s combined and the light that it carries to our eye,” Kaufman said. “Balancing those parts in relation to the whole is a key to our quality of life.”

Certain colors — and, more specifically, their pigments and finishes — can absorb light or illuminate a space. So not only should you take your personal tastes and color associations into account when choosing paint, you also should pay attention to how a specific shade might affect a room’s lighting (or lack thereof).

For instance, while collaborating with Andrew Ballard, an architect, on a Central Park South duplex, Kaufman devised a bold paint palette with colors that would elevate the architecture and enhance the amount of light various rooms received.

They used a fresh coat of mossy yellow paint in the octagonal foyer, which brightened up the windowless space and helped reflect the sunlight streaming in from other rooms.

In the dining room, a burnt red was employed to draw attention to the ironwork and millwork. Along with strategically placed skylights, the rich hue helped enhance the interplay of light throughout the room.

“Humans evolved under the sun, and radiant energy is the primary source of nourishment for human life,” Kaufman said. “Color creates visual impressions and shapes the ways we see and receive light.”

While the aesthetic value of color is hardly up for debate, researchers are still looking into its scientific significance.

In their 2015 study, “Chromo Therapy: An Effective Treatment Option or Just a Myth? Critical Analysis on the Effectiveness of Chromo Therapy,” Somia Gul, Rabia Khalid Nadeem and Anum Aslam, from the school of pharmacy at Jinnah University for Women in Pakistan, looked at the physiological and emotional effects of color therapy on 200 people ages 15 to 36.

For the study, published in the American Research Journal of Pharmacy, the researchers used lasers of different colors to gauge the physical and emotional responses to light and color of participants with various ailments. They discovered that certain hues have a “tremendous effect” on a person’s mindset. Red, for example, can enhance alertness; yellow can improve focus; and blue can reduce the onset of stress-related tension headaches.

Their findings concluded that although not widely understood, chromo therapy should be “recognized and adopted by physicians” as an “effective and potent complementary treatment option” for those undergoing conventional forms of treatment.

For those of us who just need a little mood adjustment, however, color can also be helpful. As designers have long known, by enhancing the architectural features of a space, paint can affect the way you feel in a room.

While designing the Fifth Avenue apartment of Michael Lorber, a real-estate broker, Nick Olsen selected paint colors that appealed to his client’s love of Pop Art, but more important, enhanced the character of the space.

For the north-facing living room, which doesn’t get a lot of light, Olsen chose a bright royal blue — a color that Lorber said evokes feelings of creativity in him and recalls the energy of a favorite artist, Yves Klein — applying it in a lacquer finish.

“The glossy blue reflects light from the streetscape and bounces it around the room,” Lorber said. “It feels comforting and energizing at the same time.”

The same color, though, can affect people differently.

“Color is a sensation,” Kaufman said. “And like other senses, each individual sees, feels, tastes and hears differently.”

Freymann, for instance, once painted a bedroom bright orange, which resulted in lots of sleepless nights.

“I could never sleep surrounded by such a stimulating color,” she said. “I realized moodier hues work best in bedrooms.”

So she has made it a point to stick with cool, calming colors in all of her bedrooms, painting even an awkwardly shaped guest room with little natural light a deep indigo — her way of embracing the room’s tricky layout.

“Guests always argue over who gets to sleep in there,” Freymann said. “It’s a dark and calming space that people actually want to be in.”

However subjective color may be, there is no doubt that bold hues can leave a big impression on the people surrounded by them.

Freymann is in the process of selling her apartment so she and her husband can move to Buenos Aires, Argentina, to be closer to their family.

Elizabeth Spahr, a Corcoran agent who, along with Haidee Granger, listed Freymann’s apartment, has seen firsthand the positive response to the home’s colorful interior.

At a recent cocktail reception to kick off an open house, buyers “went wild” for the saturated colors, Spahr said.

“It’s so unusual for Manhattan,” she added. “People were so inspired that they were taking pix and videos of the bright décor.”

And if some prospective buyers are put off by the color, Spahr said, they know it will be an easy fix: “No one wants to have to rip out a wall, but they’re OK with a quick paint job. They’re probably going to paint anyway.”