An apparatus for displaying a stereoscopic image, the apparatus having a predefined field frequency for displaying the image, and including a first filter means for passing a first perspective of an image with a first spectral component of a colour spectrum, a second filter means for passing a second perspective of the image with a second spectral component of the colour spectrum, and an alternating means for alternating the first and second spectral components, wherein the alternating means operates at a rate equal to an odd multiple of the field frequency of the display apparatus.