To reveal significa revelar (alguna información; mostrar, dejar ver).
No significa revelar (fotos), que se traduce por to develop.
EXAMPLES:
- His biography revealed that his acts of altruism were nothing more than a show to win the affection of his fans. Su biografía reveló que sus actos de altruismo no eran más que un montaje para ganarse el cariño de sus fans.
- He always tells us that a real journalist never reveals his sources. Siempre nos dice que un verdadero periodista jamás revela sus fuentes.
- As I passed by her room, the half-open door revealed an unusual disorder that was not typical of her. Al pasar por su habitación, la puerta entreabierta revelaba un desorden insólito que no era propio de ella.