Green screening is a popular technique used in video production to replace a solid colored background with a different image or video. The process involves filming a subject in front of a green screen background, which is then replaced in post-production with a desired background image. However, issues can arise when the green screen itself is not lit properly or when the subject is wearing clothing that is similar in color to the green screen.
One such issue is when yellow text appears pink when trying to green screen in iMovie. This phenomenon is known as chroma key spill, and it occurs when the green screen color spills over onto the subject being filmed, causing yellow colors to turn pink.
Chroma key spill can be caused by a number of factors, including improper lighting of the green screen, using a green screen that is not lit evenly, using a green screen that is not lit properly, or using a green screen that is not made of a material that is suitable for green screening.
To avoid chroma key spill, it is important to properly light the green screen. This can be achieved by using professional lighting equipment, or by using a green screen that has built-in lighting. It is also important to make sure that the green screen is lit evenly, with no hot spots or dark areas.
Additionally, it is important to make sure that the green screen is made of a material that is suitable for green screening. Some materials, such as muslin, are more suitable for green screening than others, such as paper.
Finally, it is important to make sure that the subject being filmed is not wearing clothing that is similar in color to the green screen. This can be achieved by dressing the subject in solid colored clothing that is not similar in color to the green screen, or by using a green screen that has a different color other than green.
In conclusion, chroma key spill can occur when yellow text appears pink when trying to green screen in iMovie. To avoid this, it is important to properly light the green screen, make sure that the green screen is made of a material that is suitable for green screening, and make sure that the subject being filmed is not wearing clothing that is similar in color to the green screen.
Source: https://www.videomaker.com/article/c10/18165-what-is-chroma-key-spill-and-how-to-fix-it
