Apple has been hit with a second lawsuit regarding its claimed support for millions of colours, this time revolving around its iMac product line.

The new lawsuit has been filed just days after Apple reached an out of court settlement of a previously filed lawsuit which alleged deception in the way the company made colour support claims for its MacBooks.

Legal firm Kabateck Brown Kellner has filed the new lawsuit, which claims Apple "deceptively marketed" the 20-inch iMac by claiming its displays to be capable of showing millions of colours and concealing that the monitor used in this model is inferior to that of the 24-inch iMac.

The claim states that the monitor used in the current generation 20-inch iMac isn't capable of supporting millions of colours, just 262,144 are supported. It notes that the previous 20-inch iMac model was capable of displaying 16,777,216 colours, but the current generation model isn't.

"Apple is duping its customers into thinking they're buying 'new and improved' when in fact they're getting stuck with 'new and inferior,' " Brian Kabateck, managing partner at Kabateck Brown Kellner, said in a statement. "Beneath Apple's 'good guy' image is a corporation that takes advantage of its customers. Our goal is to help those customers who were deceived and make sure Apple tells the truth in the future."

Kabateck Brown Kellner is seeking class-action status for the lawsuit.