A head-up display for a vehicle has a picture generating unit 410 arranged to generate a picture on a light receiving surface. The picture generating unit has a light source that emits light having a first wavelength; a spatial light modulator arranged to receive the light from the light source and output spatially-modulated light in accordance with a computer-generated hologram represented on the spatial light modulator to form a corresponding picture on the light receiving surface; and a hologram processor arranged to output the computer-generated hologram to the spatial light modulator. An optical system is arranged to image the picture consists of an input arranged to receive light of the picture; an output arranged to output light forming an image of the picture; a first mirror 421 and second mirror 422 arranged to guide light from the input to the output along an optical path; and at least one light-selective filter 601 on the optical path.
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