Changing the colour of an image can, intern, change the mood of the image. This is important for a film poster because it needs to correctly advertise the theme of the film.
A good example of a film changing the posters colour pallet to change the audiences perception of the film would be the two new Star Wars film posters;
Isolating the colour pallet, we as an audience react to these two posters differently, The Force Awakens poster we can see that it has a traditional narrative, the poster is split in half with one side being red-shaded and the other being blue, suggesting the conflict between good and evil. Because of the use of bright and diverse colours we can tell that this film is 'light hearted' and very traditional in terms of attitude towards real world issues.
Using the Curves tool I can adjust the image's tonal range, basically making it different shades of black and white, in this case. Because of my adjustments the original image looks much darker, flatter, thus making us react differently, The image is much gloomier and more eerie, the lack of any real information draws the audience in as they are intrigued and looking to find out more about the poster.
This is would be a very stylised poster and traditional films would rather have a bright, attention seeking poster that clearly advertises the film and any star vehicles it may have, like Harrison Ford or Daisy Ridley in The Force Awakens.
