developed
v. B1 Intermediate US //dɪˈvɛɫəpt// UK //dɪvˈɛləpt// de·vel·oped
v. to treat a piece of film with chemicals so that the pictures you took become visible.
v. to treat a photographic film or plate with chemicals to render a latent image visible. Transitive in this sense, requiring a direct object such as 'film' or 'photos'.
I need to get this roll of film developed.
She spent the entire afternoon in the darkroom to see how the portraits she took at the wedding developed.
Before digital sensors became the industry standard, photographers had to wait hours or even days for their negatives to be developed in a laboratory before they could review their work.
Usage
The verb is transitive when referring to the act of processing film; it can be used in the passive voice ('the film was developed').