Hello and welcome to the computer lab so in this video I'm going to show you how
to use green screen special effects using inbuilt free programs keynote and
iMovie on your Mac ok so let's get started open keynote up and from the
themes that we have the options for we can have a pick the black or white one
it doesn't really matter because we are going to change the colour of it in a
minute so I'm going to choose the white one and we then need to delete the two
sections out in the middle I'm just reducing it down to 75% there
just so you can see the section that we're working off for this particular
video so delete the two bits of predefined text out just by clicking on
it and it's in a Delete key and now we need to decide on what size we are going
to use now my video that I'm going to overlay this on to is 1920 by 1080 HD
video so I'm going to make my piece of work area exactly the same size if you
want to change yours you can click on the document in the top right hand
corner you'll notice my I'm currently set on widescreen so if I leave it on
widescreen and then click on custom size you will see the size that it is defined
at the moment which is 1920 by 1080 so if you want to change that size for
example if well to run off this standard size if I click on standard and then go
to custom it will show me the standard size which is 1024 by 768
so I'll cancel out so you can let's set a specific video size overlay in there
it's best to try and get this size how you want it so you can get a scale of
where the item that you're going to put into the video where it's gonna sit
within your video frame okay so I'm happy with the 1920 wide by 1080 high so
now I need to find a image that I can use you might already have one that you
cut out or pre-clear out or a photo or you've taken or a low we're going to use
and I'm just going to do a quick search on the internet for a free PNG that I
can use so I'm using a PNG because they have a transparent background so I was
going to look for so it says coffee time with PNG at the end
of it that's the file format that I want click on Google search and then also go
and click on images so searching within the images database and also because I'm
using this on the video its usage rights need to be able to be open so all these
ones that is showing that moment these are somebody's property so if we click
on tools make sure that we click on usage rights for this particular video
labeled for reuse with modification so I want to reuse it obviously to create
this video as a couple in here and I think we'll probably go for that one
let's write the top of the list the post-it note and yellow looks about
right size 720 x 720 so it's clear enough and I can tell by the checkered
background that this is a PNG so right click and then save image as see where
it's going to save it's gonna save it into pictures I'll just get rid of this
bit at the end and just make sure it just says coffee just so I can see it in
my Finder window - pictures save as PNG click on save if it's a download and
then minimize that window okay so now I need to drag that into my work area so
open finder back up find out where you have saved it click on pictures in my
case and then I'm gonna drag this PNG on to my work area like so they can resize
this and put it exactly way well and this is why it's quite important why I
got that 1920 by 1080 in my case because that's the video size I'm going to
overlay this on so I have a rough idea of what it's going to look the video
that I have done as a coffee cup steaming on the right hand side so I'm
just working on this logo on the left hand side and make sure it's about the
right size we just see in a minute when I overlay this onto the green screen and
the video that I'm going to put it on so the next thing is to animate the PNG
that we've just put onto our work area so up to the top right hand corner onto
the top right hand corner sorry click on animate we have a couple of options
there building action and build out so the one I'm going to work on first is
the buildings this is the thing that's gonna happen first so we have lots of
different options in keynote and different animations we have moving you
can preview by clicking on a little preview icon and you can preview one of
the other ones for example and see if I want little like once you found one it
just actually click on the actual action itself and you can change what
you want it to do so for example this one bounces once it's finished the movie
click on preview see it bounce at the end of its left to right movement come
up without limits as it is and I'll click on action so this is the middle
action that's going to perform so again I've got a couple of options in here
this the once it's actually done its first this is the second thing it's
going to do so you can see as I preview on each one of these it does different
things I'll just try and find and it looks like it's appropriate maybe the
jiggle that'll do is I think for this video at least we can see it's doing
something so you see it's jiggling and the duration it's jiggling for is a 1 a
second now I want it a bit longer I think just so it can get a good
appreciation of the effect so maybe up that to say 4 seconds click on preview
so now it jiggles for the 4 second period so I've got me build in which is
coming in left to right it jiggles in the middle so now I want it to how I'm
going to finish it I couldn't leave it as it is now but I'll put a third effect
in as well maybe a confetti now think there's crumbles quite a good one so go
a crumble click on crumble and that's the third effect so I've got
three different fingers going on there I'm building in left to right I do a
jiggle and then it crumbles on my third item so on the order you can see that
that one's in this third place but I need to now build the order to make sure
they all complete and all do the actual action one after another so I can
drag these in the build order so if I've got a complex action going on I can
change these by left clicking on the item I want and then dragging it into a
different position so for example if I wanted the dissolve to happen second I
could drag that into that position I don't in my case I want it to happen as
I've done it but I also want them to automatically do their actions so on the
second item I want to that's happened after the first thing is finished and
then for the third one I want that to happen after the second finish finish so
now they're all joined up I can click on preview shows the icon coming in does a
jiggle and then it should crumble away the only thing left to do in keynote is
to give our background a green screen so we need to go up to the top right hand corner again
click on format and where it says background we then need to click on the
little box to the right which will allow us to pick our color we can pick green
or a blue or what either will work once we open this in iMovie so I'm just going to
pick green because everybody knows about green screens and once we're happy with
that the green is in position we can then export this file so click on file
export to I want to export it to a movie and make sure the resolution is set to
the size that you're working with so I'm going to using at 1080p as I explained
it at the beginning the video everything else looks good I can click on it next
this will export this as a small mpeg-4 video which I can then add it to iMovie
so just going to give it a name so I can find it again in a second so coffee logo
or it's saving into movies click on export ok so it is now exporting at the
movie then get rid of that one now I can get rid of these in fact no I'll leave
finder there for a second so now open iMovie up now I've already put a file in
iMove and called it green screen and it's like I say
it's a video of a cup of coffee it's a free video downloaded off the internet
that is labeled for reuse so I just wanted something with a bit of movement
in okay so I've got the cup of coffee here like so it's steaming stationary
camera but with a steaming cup of coffee so I need to add the file so I'll just
drag this onto my timeline first so there we go that's the video playing as it
is at the moment and I want my action for my coffee post-it note to come in
from left to right so we'll stop that go back to the beginning and then we need
to open our Finder window up find the picture that we have just exported our
mpeg-4 movie so I'll drag that onto our iMovie library minimize finder the window
for now we can see there there's our small movie the clip that we created so
I left click onto that and then drag it onto the top of my video file you'll notice
obviously the green screen is still there at the moment that's even that's
because it's on top of the coffee video so I need to get rid of the green screen
so just pause that so make sure that you have the green screen clip highlighted
indicated with a yellow border go to the top menu in iMovie click on the video
overlay settings box and then you've got another submenu with a couple of options
in we want green and blue screen and you can see straight away that removes the
green screen element of the clip and it leaves our post-it know so I'll just hit
play now and we should see the post-it note coming from the side do is jiggle
and then it is all the way so that's how to create an animation using keynote on
your Apple Mac and also how to create a green screen effect in iMovie using the
animation from keynote if you like the video please do subscribe to my channel
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comments below are always appreciated and thanks again for watching the
computer lab