Editing Chroma key (section)

====Lighting====
In order to create an illusion that characters and objects filmed are present in the intended background scene, the lighting in the two scenes must be a reasonable match. For outdoor scenes, overcast days create a diffuse, evenly coloured light which can be easier to match in the studio, whereas direct sunlight needs to be matched in both direction and overall colour based on time of day.

A studio shot taken in front of a green screen will naturally have ambient light the same colour as the screen, due to its light scattering. This effect is known as ''spill''.<ref name=Foster />{{rp|p20}} This can look unnatural or cause portions of the characters to disappear, so must be compensated for, or avoided by using a larger screen placed far from the actors.<ref>{{Cite book |last1= Aronson |first1= David |author-link1= David Aronson |title= DV Filmmaking: From Start to Finish, Volume 1 |year= 2006 |publisher= O'Reilly Media, Inc. |isbn= 978-0596008482 |pages= [https://archive.org/details/dvfilmmakingfrom0000aron/page/52 52–53] |url= https://archive.org/details/dvfilmmakingfrom0000aron/page/52 }}</ref>