1. A method of displaying an image using at least a first projector and a second projector, the method comprising: projecting a calibration pattern using the first projector, the calibration pattern being embedded in a first portion of an image projected by the first projector; determining a contribution of the second projector to projecting a second portion of the image to an overlap area, the overlap area having a contribution from the first and second projectors, wherein the contribution is an intensity of a colour channel; modifying the determined contribution of the second projector to the overlap area to allow the calibration pattern of the first projector to be detectable to a capture device, the modification having a pattern corresponding to the calibration pattern; and displaying the image using the first projector and the modified contribution of the second projector.