The photonic hook (PH) generated by a partially illuminated high-index dielectric particle hemi-immersed in the dielectric film is investigated. A tunable PH is generated from a cylinder deposited on a dielectric film, and the cylinder is partially illuminated by the placement of a thin, flat aluminum mask in front of it. The effects of film type, mask width, and height of dielectric film are mainly discussed. The results provide a novel design method for PHs, which have potential applications in optical manipulation and high-resolution imaging.