Colour (or lack of colour)
Can be used to draw attention to something. Colour can also be used to identify characters, create mood or emotion and evoke a time or place.
Coloured filters and gels can be used to change the colour of a film, this is achieved by placing the filter or gel over the lights or camera lens. Another way to achieve this is by digitally adding colour during the post-production process.
Movies are coded by genre. For example, horror films are often blue, films set in the desert are yellow and films where reality is off-kilter are green.