Getty Images Inc., the world's largest photo agency, complained earlier this year to European antitrust officials that Google Inc. unfairly favors its image-search service over rivals, potentially adding another sector to the continent's antitrust investigation of the Internet-search giant.

In early June, the European Commission told Getty that its concerns were relevant and added Getty as an "interested third person" in its search-manipulation case against Google, according to a document reviewed by The Wall Street Journal. That allows the firm to participate in hearings and submit evidence to the European Commission, according to antitrust experts.

The commission in April charged Google with favoring its own shopping service over rivals in search results. The regulator wants Google to change how it ranks shopping services and warned of large fines if Google doesn't comply.

Beyond shopping, the commission also said it was actively investigating Google's alleged favorable treatment of specialized search services in areas such as local search, travel and maps. Getty's complaint could ultimately add image search to that list.

"It's entirely possible for [the commission] to expand the scope of the investigation" based on additional information from companies in related businesses, said Alan Riley, a competition-law expert at the law school of City University London.

The European Commission declined to comment.

A Google spokesman declined to comment. Google has denied breaking EU antitrust rules. U.S. regulators closed their own investigation into Google's search practices two years ago after the company agreed to voluntary changes.

Getty Images, majority owned by private-equity firm Carlyle Group and part-owned by members of the Getty oil family, has a digital trove of more than 100 million images, which it licenses and sells to publishers, advertisers and websites. More recently, it has been building a consumer business to distribute its images more widely, putting it in closer competition with Google.

Getty told European regulators that its efforts to drive traffic to its websites, including gettyimages.com, have been stymied by Google's prominent display of its own image search service in general Google search results.

In one example Getty cited, a search for "stock photos of coffee shop" on Google.com showed a page with ads and results from Google Images above a link to coffee shop photos on gettyimages.com.

This positioning drives more traffic to Google Images, even when it's not the best offering for consumers, Getty argued. That's because Google Images includes photos from other websites and publishers, rather than original, licensed content, the firm said.

The lack of traffic to Getty Images' websites also makes it harder for the company to collect data on visitors and their searches, information that can help improve its image-search service, it told European regulators.

Google has "created a captive environment that ensures that traffic on Google almost never diverts to the source sites of the images," a Getty Images spokesman said in a statement.

Getty Images' revenue growth has slowed because fewer people are coming to its websites from Google search pages, which means less of its content is being licensed and purchased, according to a person familiar with the situation.

Getty Images also complained to the European Commission that when Google shows large, high-quality Getty-owned photos and puts them on its own Image Search service this encourages people to copy the images for their own use, potentially infringing photographers' copyright.

Getty Images sued Microsoft Corp. in 2014 alleging a Bing image search service infringed copyright. Getty dropped the suit this year. The two then signed a partnership deal in which Getty provides licensed content and related data about the images and Bing shows official versions of its photos in search results. Getty told European regulators that Google has refused to pay or partner like this.

This touches on another part of Europe's broader investigation of Google. The regulator is looking into complaints that Google copies rivals' Web content for use on its own sites, a practice known as scraping.

Tom Fairless contributed to this article.

Corrections & Amplifications

Getty Images is majority owned by private-equity firm Carlyle Group. An earlier version of this article incorrectly said Getty Images was majority owned by Hellman & Friedman LLC.

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