Need help to change background and more

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hey everyone! first ever post on forum excuse me if not good.

 

right in school having movie making project , me , group want impress teacher much. decided our film set on boat on way sink, , before sinks know different families/people on boat , how turns out these different families when boat starts sink. problem not have boat. have after effects, , normal sized sheet blue can used blue screen!

 

 

i know how chroma key easily, scenes need bigger blue screen have
     have spent few hours looking tutorial on how maybe change background without blue screen cant seem find tutorial helps me want with.

 

for ex. 1 of our scenes cars driving on boat , blue screen isnt big enough cover entire car, , ground beneath our car gravel, , cant have that. there here knows few videos on internet might me, or kind soul write me text tutorial on how this?
/kind regards, axel.
(btw im swedish excuse me bad spelling/grammar)

there many times when green screen not large enough cover entire subject. end using combination of green screen , rotoscope. in car driving boat example position blue screen blue screen behind windows of car because wold hardest parts of car rotoscope hand. easy rotoscope wheels , bottom of car.

 

take @ video lynda.com - great source of after effects training. show how multiple masks used clean green screen when not cover entire scene.

 

there great commercial singapore airlines called across world had actress walking continuously through shot seamlessly moved san francisco paris venice , in of transitions walked past green screen big enough cover here head , shoulders because it's difficult rotoscope hair , hands when moving. took quick behind scenes video produced when released commercial couldn't find exact one. if closely in video you'll see folks moving green screens around walking.

this technique used on blockbuster movies. note green screen here doesn't hide entire background, parts difficult if not impossible rotoscope.

trio-greenscreen.jpg



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