public void setColorInfluencePaper(float colorInfluencePaper) {
        this.colorInfluencePaper = colorInfluencePaper;
        if (material != null) {
            material.setFloat("ColorInfluencePaper", colorInfluencePaper);
        }
    }
Sets color influence of original image on non-line areas

@param colorInfluencePaper the desired factor (default=0.1)
jme3-effects/src/main/java/com/jme3/post/filters/CrossHatchFilter.java