The introduction of white light in several fields of optics such as interferometry, diffraction and optical testing, has produced many valuable contributions that frequently have led to optical techniques of present application. The use of white light in optical processing also allows to extend the capabilities of this field by including new operations and applications, besides other advantages related the reduction of noise. White light processors are able to encode through different wavelengths distinct types of information. The display of information using several wavelengths or spectral bands is specially adequated in images addressed to human observers or other colour sensitive receivers, since these receivers can take advantage of the high sensitivity of the human eye to small changes of colour. In this way different pseudocolour techniques addressed to enhance through colour distinct types of information have been recently developed . The parallel white light processors could be used to process images for direct analysis or could serve as preprocessor which derives colour encoded texture information for further processing by digital, optical or other techniques. On the other hand white light processors enable direct enhancement and restoration of colour images. Images with poor colour saturation due to inadequate illumination or registration conditions can be enhanced by spatial filtering. Also, images with spatially invariant degradations such as defocusing and chromatism, can be restored in white light by optical or digital techniques.