Apple has been hit with a class-action lawsuit by MacBook owners who claim the company falsely advertised the quality of the displays used in the notebooks. Two California men allege they were promised displays capable of showing “millions of colors,” but instead were sold displays of lesser quality that looked “grainy” and “sparkly.”

The suit alleges Apple misled them with MacBook and MacBook Pro advertising that claimed the displays are capable of 8 bits per channel, which may display as many as 16 million colors. Instead, the suit claims, Apple used displays in the MacBook that support only 6 bits per channel, offering about 262,144 colors.