Abstract: Apparatus for obtaining a desired tint, which apparatus uses a light source to provide a gamut of colours. The apparatus comprises wheel and paddle (34,60) which enable a tint to be obtained from such light in such a manner that the hue and saturation of the tint can be varied substantially independently of one another, whilst maintaining a given brightness. The invention extends to a method using such apparatus, and to equipment comprising a set of coloured filters, and also to a method in which a tint created by a combination of filters selected from a set of filters is varied, by removal, addition, or replacement of one or more filters of the combination, to match the selected tint, and finally to the making of lenses using such methods, and the lenses themselves.

Abstract: A pseudo-luminous panel has a substrate and a thin film optical color filter formed all over the main surface of the substrate with or without a reflecting film interposed therebetween. The main surface of the substrate is formed by obliquely downward and upward band-like surfaces alternately arranged side by side in a vertical direction. The downward band-like surfaces of the substrate, or downward band-like surfaces of the reflecting film formed on the downward band-like surfaces of the substrate are each a smooth reflecting surface. The upward band-like surfaces of the substrate, or the upward band-like surfaces of the reflecting film formed on the upward band-like surfaces of the substrate, are each a smooth, irregular or uneven reflecting surface. Obliquely downward band-like surfaces of the color filter are each a smooth surface extending straight in the longitudinal section of the panel, and obliquely upward band-like surfaces of the color filter are each a rough surface.