A California-based software developer is suing Adobe.

The suit was filed by graphics software publisher Shell and Slate Software on Monday in the US Federal District Court for the Central District of California Cnet reports.

The company claims that features in Adobe's latest version of its Photoshop image-editing application infringe trade secrets held by Shell and Slate. The suit refers in particular to Photoshop 7.0’s Healing Brush, a touch-up tool.

Shell and Slate was formed two years ago by Ben Weiss. His lawyer confirmed the lawsuit but declined to comment on it.

An Adobe representative said the company would challenge the suit: "We don't believe it has any merit, and we intend to defend ourselves vigorously", he said.