A method for testing a display includes capturing information displayed by the display at a location of an identifier displayed with a frame of a sequence of frames; and analysing the captured information. The method further includes determining a colour of the identifier; and using information on the determined colour to determine at least one of the following: a change of a frame in the sequence of frames displayed by the display; a timestamp of a frame in the sequence of frames displayed by the display; a frame of the sequence of frames not displayed by the display. An apparatus for implementing the method is also included.