The method renders unobservable cross images with low light intensity that appear in the combined reproduction of various different images. It consists of adding a percentage in negative of each of these cross images to the positive of the correct image prior to reproduction, so that as a result of this addition it is possible to obtain, instead of the cross image, a uniform, contrastless image, i.e. where all the points have the same light intensity, which is generally so small as to be unobservable.