k3d/share/shaders/k3d_graphic_lines.sl:63:        float brightness_ink=0.5;
k3d/share/shaders/k3d_graphic_lines.sl:283:	illumination_ink=(illumination_ink*contrast_ink)+(1.0-contrast_ink)/2.0+(brightness_ink-1.0)+n_ink*randomness_ink;
