Green screens are great for films where they need to edit out the background or certain parts of the footage. Lots of "impossible" scenes, like flying, or some stunts, would not be possible without the usage of green screen. In a lot of video editing programs you can use chroma key to key out the green so that you are left with just the person. Green and blue are used because they aren't seen in a person's skintone, as well, the camera is most sensitive to those colors. Green is more often used though.
Green screen is for making effects in background.
example: Star wars. They cant realy make a film in spcae so they just add green screen in background and later with their computers and some nice programm edits it and adds ships objects etc.
And for making objects in movie they make green things in the for of needed object in movie, like space ship in backyard. they just add big green box and wolaaa they make it look like space ship :)
Blue is actually another popular color used for a chroma shoot. Green and blue are ideal colors for the technique because they are the colors least like an on-cam talent's skin tone. Green is used for more outdoor shooting cause the blue sky on frame could get accidentally replaced during the chroma keying. ditigal cameras also seem to retain more detaill in the green channel and it demands less lighting requrements compared to blue.
Because they need the backdrop to be one color. Because they program the computer to find everything on that color and remove it, then put in a different background. It isnt always green though, it can be different colors.
Movies use green screens because sometimes the locations they want either are too far away, not unable to flim there (due to restrictions), or etc reasons. Some just use them for the special effect scenes.
to put in parts they have to use a computer for, like effects. So when they are filming those effects aren't going to be in there, thats why they need the green screen
Green screen is also known as augmented reality, which is pretty cool to play around with.
thankyou, your so smart :) that helps me out alot
yeah but why green?
hope that helps :)