A process of filtering digital images to reduce image flicker. The web structure comprises a plurality of neighboring web patterns, where each web patterns is composed of adjoining webs, and the web patterns are interconnected by connection elements. A multilayer plastic, resiliently flexible thin flap is fixed with the case extending away from the case generally in a common plane with the case. A color filter for a display device is also provided. Alternatively, conventional water reducers or superplasticizers can be employed initially, followed by the later-slump-enhancing admixture composition.