Final answer:
The main purpose of the gelatin emulsion in radiographic film is to enhance image resolution by capturing and holding the X-ray image formed by the interaction with silver halide crystals.
Step-by-step explanation:
The main purpose of the gelatin emulsion in radiographic film is to enhance image resolution. Gelatin is used as the binder in radiographic film, which holds the light-sensitive silver halide crystals in place. When the film is exposed to X-rays, the gelatin emulsion helps to capture and hold the image formed by the interaction of X-rays with the silver halide crystals.