Abstract: A method and an apparatus for exposing light-sensitive materials, including a first light beam conducted from a light source with the wavelength &lgr;1 to a first exposure point on the light-sensitive material via an optical system. This system has at least one input end and one output end as well as at least one reflecting or transmitting rotating optical element arranged relatively to the optical output end, wherein at least one additional light source generates an additional light beam with a wavelength &lgr;x which is different from &lgr;1.

Abstract: The invention relates to a method and an apparatus for the analysis and correction of colour casts in a digitally represented image. According to a preferred embodiment, the crominance contents of the image may be transformed by use of a Hough-transformation or the like transformation, wherein the line structures in the carthesic system of co-ordinates for the crominance content is transformed to a representation in a Hough-diagram in the form of a polar system of co-ordinates, since such line structure is hereby transformed into a point structure. The Hough-diagram is examined with a view to finding a cell in the diagram which has the highest value and the cell found is saved. subsequently cells are neutralized in the Hough-diagram within a predetermined angular distance, and the Hough-diagram is re-examined with a view to finding that diagram cell which, following neutralization, has the highest value.