ɪnðə fˈɪlm ænd stˈeɪdʒ ˈɪndʌstɹi, ɐ dᵻfjˈuːʒən fˈɪltɚ mˈeɪ ˈɔːlsoʊ biː kˈɔːld dᵻfjˈuːʒən dʒˈɛl, ɔːɹ dʒˈʌst dᵻfjˈuːʒən.
In the film and stage industry, a diffusion filter  may also be called diffusion gel, or just diffusion.