Ms. Torre is a familiar face to NY1 viewers, but she said her on-air presence had been steadily eroded since Charter took over. Once entrusted with three hours of solo anchoring time on weekdays, Ms. Torre says she now has one hour; some of her co-anchoring time was cut, too. And her theater reviews no longer appear on the weekly Broadway roundup, “On Stage,” she added.

The lawsuit also includes Ms. Torre’s frustration with NY1’s favorable treatment of Pat Kiernan, its star morning anchor.

Ms. Torre’s salary is “less than half that of Mr. Kiernan,” the suit alleges. It also says that Ms. Torre was barred from using the makeup artists provided for Mr. Kiernan’s show, and that when she asked to use his revamped studio, a manager told her to “stop complaining.”

When Mr. Kiernan celebrated 20 years at the network, NY1 promoted the anniversary with an ad campaign, on-air segments and promotional food trucks. “Ms. Torre, by contrast, with a longer tenure and celebrating 25 years on air with her own daily live show, received no special promotion whatsoever,” the suit says.

When Ms. Torre received a local Emmy Award in May, the official NY1 Twitter account posted a photograph of her accepting the prize — with Mr. Kiernan featured in the foreground, snapping his own picture of Ms. Torre. The suit calls the tweet a “blatant” example of “NY1’s favoritism toward Mr. Kiernan at Ms. Torre’s expense.” (When a user on Twitter asked why the network “couldn’t let Roma have her moment,” Mr. Kiernan replied: “I’m so sorry you interpreted this like that. I was just trying to get the shot.”)

Ms. Torre and her fellow anchors are represented by Douglas Wigdor, a prominent Manhattan employment lawyer who represented the hotel maid in the sexual assault case against the former International Monetary Fund leader Dominique Strauss-Kahn. He has sued major corporations, including Starbucks and Citigroup, and filed multiple discrimination suits against Fox News. (Mr. Wigdor’s firm also represents clients in a racial discrimination suit against The New York Times.)

“Our five clients have clearly been told that their careers are over, as NY1 seems to believe that younger faces, when it comes to women, are a ‘better look’ for the bottom line,” Mr. Wigdor said in a statement.