Sub Genres and Hybrids

A sub genre is a genre within a genre.

Hybrids are made of multiple genres.

Examples of hybrids:

Speed - Action Thriller

Sin City - Action Noir

District 9 - Action Sci-fi

The Departed - Action Crime

Star Persona

This is  when an actor is associated with a genre and personality of character.

Crime Thrillers
A crime thriller is a sun genre of both crime films and thrillers. A crime thriller involves either successful or failed crimes and focuses more on the criminal then the police. They usually focus more on the action than the psychological aspects.

Conventions of a crime thriller

• Crime thrillers usually contain robberies, chases, murders and shoot-outs. Double-crosses are also commonly used in crime thrillers.
• They involve lots of suspense, action and violence.
• There is usually an investigation into the crimes committed.

• The props used in crime thrillers are usually weapons, fast cars, armoured trucks and police equipment. 

• The costumes used in crime thrillers are mostly police uniforms, or smart men in suits because it shows authority and dominance.

• The lighting in crime thrillers is low-key lighting because it creates shadows which adds tension to the scene.
• The colour scheme in crime thrillers is also rather dull which emphasises the sadness and depression in the scene.

The Departed is an excellent example of a crime thriller. It follows the investigation of a South Boston gang. The film features a corrupt cop who works on the inside of the investigation to aid the gang but he kills the gang leader at the end to not appear as the mole. There is also another cop working undercover to bring down the gang and he is told to identify the mole in the investigation.  

The film features lots of action and shoot-outs and it features a lot of the investigation. Suits are worn by both the police/detectives and gang leaders to show their authority in both sides.