Editing Chroma key (section)

==Clothing==
{{multiple image
| footer            = A model wearing blue clothing in front of green screen. The shadows cast onto the green screen are not ideal (see [[Chroma key#Even lighting|even lighting]]).
| image1            = Girl in front of a green background.jpg
| width1            = {{#expr: (260 * 640 / 960) round 0}}
| image2            = Girl in room, green screen example.jpg
| width2            = {{#expr: (260 * 707 / 892) round 0}}
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A chroma key subject must avoid wearing clothes which are similar in colour to the chroma key colour(s) (unless intentional e.g., wearing a green top to make it appear that the subject has no body), because the clothing may be replaced with the background image/video. An example of intentional use of this is when an actor wears a blue covering over a part of his body to make it invisible in the final shot. This technique can be used to achieve an effect similar to that used in the ''[[Harry Potter (film series)|Harry Potter]]'' films to create the effect of an [[Cloak of invisibility|invisibility cloak]]. The actor can also be filmed against a chroma-key background and inserted into the background shot with a distortion effect, in order to create a cloak that is marginally detectable.<ref>{{cite web |url=http://library.creativecow.net/articles/stern_eran/Invisible_Cape.php |title=Creating an invisible cape in After Effects |publisher=Library.creativecow.net |access-date=20 July 2011 |archive-date=28 March 2019 |archive-url=https://web.archive.org/web/20190328142323/https://library.creativecow.net/articles/stern_eran/Invisible_Cape.php |url-status=dead }}</ref>

Difficulties emerge with blue screen when a costume in an effects shot must be blue, such as [[Superman]]'s traditional blue outfit.  In the 2002 film ''[[Spider-Man (2002 film)|Spider-Man]]'', in scenes where both [[Spider-Man]] and the [[Green Goblin]] are in the air, Spider-Man had to be shot in front of a green screen and the Green Goblin had to be shot in front of a blue screen. The colour difference is because Spider-Man wears a costume which is red and blue in colour and the Green Goblin wears a costume which is entirely green in colour. If both were shot in front of the same screen, parts of one character would be erased from the shot.

For a clean division of foreground from background, it is also important that clothing and hair in the foreground shot have a fairly simple silhouette, as fine details such as frizzy hair may not resolve properly. Similarly, partially transparent elements of the costume cause problems.<ref name="bermingham" />