1. Apparatus for imaging, comprising: a representation generator arranged to generate a three dimensional representation of a scene; an image segmentation process arranged to identify objects located at different depths in the scene; at least one visible light imaging sensor arranged to obtain a visible light image of the scene; at least one infrared imaging sensor arranged to obtain an infrared image of the scene; and an image overlaying processor arranged to: overlay the infrared image and the visible light image onto the three dimensional representation of the scene to produce an multispectral three dimensional representation of the scene; and manipulate the overlaid infrared image in the multispectral three dimensional representation of the scene according to the depths of the identified objects such that: the infrared image is not overlaid onto objects in the scene that do not satisfy a predetermined depth requirement so that a palette of false colors used to represent temperature data in the infrared image is adjusted to extend over the range of temperatures observable at objects satisfying the predetermined depth requirement; and the visible light image is overlaid onto objects in the scene that do not satisfy the predetermined depth requirement.