The clear film will exhibit transparent colors, except black, which is opaque. The higher the black content of a dark color, the more opacity it will exhibit. Of course, any area that is white in the image will be clear when printed on clear film. There is a backlit version with adhesive, but the OP asked for clear. The backlit version has a diffusion layer which appears white in the unprinted areas, but the film is opaque and that may not work for the window application of the OP.