Unit 17-P2

Visual effects

There are many ways to enhance a film with costumes, performance and acting but visual effects can add a whole world or models in different ways.

One of the famous ways to do visual effects is the use of green and blue screens. They are normally use as backdrops and can be edited or “Chroma keyed” in editing to be a different background or location. The difference between a blue and green screen is the colour and how they are used. A blue screen is used more for darker and gloomier backgrounds as it requires less colour spill and less background noise. A green screen is used for daytime shoots and it is a colour far away from a human skin tone. A green and blue screen can be also used to coat over a person who is helping with another visual or special effect so many actors or crew will wear green suits so they can be edited out of the film if they are not needed and can cause the effect to be ruined.

Traditionally Matte painting was artist painting on glass and they will leave spaces on the glass or not paint on them as footage was composited and made to fit in that small hole this was used to save money such as not hiring extras and painting wide landscapes something that will cost money and time to build to use for a background. Matte painting has now been moved into the digital side and is created on a computer or a software.

Morphing allows two or more real objects to be transformed seamlessly together this creates a sense of believability as there are no cuts in the film. They are changing a state of one object or person into another state.  This creates a sense of wonder and excitement amongst the viewer as they see the transformation.

CGI or computer generated image is an element or model to be used with actual footage it used to create something that cannot be done in real life such as a laser beam or it is used to add onto an effect such as an explosion to more emphasis.

Rotoscoping is the process of painting on a visual effect after the footage has been shot. It can also be used to remove an effect such as wires or cables from a prop that has been used in the footage. The use of it is to add an effect that can’t be done with a physical model or if done might look weird so rotoscoping is used to enhance that effect.

Compositing is the combining of visual effects and elements into a single image or scene to create the effect that those elements are part of the same place such as adding an effect onto a moving car or adding an animal walking by a person. This includes green screen and blue screen background effects as well.


These elements of visual effects are used in the film Dr strange (2016) to create the world of magic and transforming the everyday environments into a spectacular scene. For example, the use of a green screen is used to create out of world and spacey backgrounds  at 0:08 to 0:32 of this scene[1]  the background of Doctor strange is a green screen and is the moving elements behind him are computer generated and are composited. This adds to believability that Doctor strange magic can transport him to different dimensions or worlds as he is not on earth to bargain with an evil being. Doctor strange uses magic which is not a real thing and can use elements such as portal and can travel instantly using them the green screen effect in this scene adds to the realism of the film as he has travel into a different area which is not on earth the use if the background shows this its dark and has gases and space like elements everywhere we are not on earth but in a different magical area.
rotoscoping is also used in this scene[2]  at 2:19 to 2:23 rotoscoping is used alongside a green screen effect to add the buildings moving and transforming  also to add colour to the shots giving the real life feel towards it. The believability this shows as in the narrative they are in a mirror zone only the people in the zone can see and transform what happens around them since Doctor strange and crew are in this zone they can manipulate building using magic and transform what is around them.

The visual effects of the spells used and the sparks are all CGI. For example the scene where Doctor Strange is fighting in a hallway he uses his spell to conjure up mini shields and weapons[3] at 0:35 to 0:39 He magically appears his shields this is composited using CGI as the spells use are and look see through there is no way to make it look real using models. also Doctor strange using magic he must make them appear out if thin air if models and real object were use the narrative of the film would not make sense as he is not using magic and would look fake also the sparks add the effect of believability as he is rushing, hurt and is still new to using magic.

[1] https://youtu.be/yKAfwBPvsMA
[2] https://youtu.be/v-G5rpTKE9Q
[3] https://youtu.be/QjyUC_cu8yA

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