both Photography and Film studies have their own courses, although you can transition into film and photography from other specialisms.
For example Art, or Media Studies are both relevant to informing how to create good photographs and films. The idea of composition, and light should be taught in traditional Fine Art, this is extremely relevant to photography, both still and moving image.
Photo manipulation and digital photography mean that understanding graphics programs and how to use computers is also really important.
Ultimately you are learning to become a master of crafting light, shadows and colors to tell a story and create a mood.