ROCHESTER — Eastman Kodak Co. said Thursday that it expects improved earnings this year, driven by its digital printer businesses and leaner costs from years of restructuring.

But investors appeared unimpressed with the forecasts, sending its shares sharply lower a day after they briefly touched a 52-week high.

At its annual investor meeting, the picture-taking pioneer said it expects digital sales to grow between 5 percent and 9 percent in 2010. Offset by a more moderate drop in traditional film-based revenue, projected sales overall will be flat to 1 percent higher in contrast with a 19 percent slump in 2009.

Kodak said net earnings from continuing operations will range between a loss of $50 million and a profit of $50 million, which would work out to about 19 cents a share in either case. The company lost $210 million, or 78 cents a share, in 2009.

Sales will reach $7.5 billion to $7.7 billion, versus $7.6 billion in 2009, Kodak said. Analysts surveyed by Thomson Reuters are looking for revenue of $7.66 billion.

Analysts, whose estimates typically exclude one-time items, expect on average that Kodak will earn 74 cents a share this year.

Kodak shares, which hit a 52-week high of $6.94 during trading Wednesday, fell 74 cents, or 10.8 percent, to $6.09 in trading Thursday.

Ulysses Yannas, a broker with Buckman, Buckman & Reid in New York, attributed the drop to the broader market’s slide Thursday. “When a stock goes up 40 percent in two or three days and the market takes a dive, it’s normal for it to be down,” he said.

Kodak broke a series of four straight quarterly losses with a $443 million profit in the last three months of 2009. Its results, posted Jan. 28, were lifted by consumer and commercial inkjet printer sales and big licensing gains from its rich array of digital-imaging inventions.

“We feel that even with a so-so economy, we’re going to have a much improved 2010,” Perez said Thursday in an interview with the Associated Press.