Guys and welcome to this new lecture where we are going to tackle here the difference category the difference
category have some special effects that I like very much.
It's hard to predict what the difference will do or not because aftereffects goes randomly but because
the calculations are pretty hard.
But there are two exceptions about the black and the white color that are very useful.
The best way to demonstrate you is using these two shapes with different colors for their borders and
their field videos it will become quite hard to you know show you the difference and show you how that
works.
Let's take the source.
That's the top layer and change it to difference what aftereffects did here is to subtract the darker
color the stronger cause from the lighter ones.
And then you have the result the White has been subtracted from the red and you have the result.
Same same for this pink area here.
The White has been removed from the green and you have the results here.
So that is a difference and it's quite complicated to predict the results but it's quite easy to look
at the results.
One major difference about difference is that if one of the background is black for example then the
underlying colors are not changed at all.
So you see here because I put black in the field then the green and the red did not change at all.
If it is wide then that is quite some change.
Let's leave it to right now.
This is about difference.
If you go to classic difference is useless because it's just for compatibility.
If you go to exclusion now also it does the same calculation but it is with less intensity.
And that's it about exclusion.
If you go to subtract now it becomes more interesting not just the black area.
Subtract if the source is white then the result is black and that is pretty interesting.
Just give it a thought.
If the source is white then the result is black.
So it is pretty interesting when you have a video or an image that has lots of white.
You can't turn them into black.
Using subduct quite interesting.
Right now the vivid here is the whole subject by itself.
But nevertheless in the vivid you know this is when the source is white then there is no change in the
underlying cause.
But this is pretty good.
I have explained to you about the black and white and how it works.
Let's get an example.
I will hide this ones and open the shy and I have two layers here.
The escalator that you have already see it and the fire that I want to show you now.
Hopefully it will render pretty fast.
This is the fire.
If you know this also a motion graphic that I use a lot.
This file comes from picks.
You can take some areas and make it very very interesting.
So this is our fire.
Now what are we going to do if you put the escalator and we use this phrase like it's already there
and we run.
You're not is that it has some amazing effect.
Just want to show you know how the fire has spread all over the town.
If you want but look it's not effective everywhere.
If you for example multiply your lot is somehow uniform.
If you as the others even overlay it's very uniform.
But with that difference it is not uniform at all because of the subtraction.
So you have the blues here you have the ultimate red fire here.
And if you go in Florida you notice that the fire is consistent with the color.
So that is what subduct does or the difference does and it's very interesting if you go to subtract
now then the whole thing has changed and it's pretty interesting.
Now you have a dark scene where the fire just spreads.
Let's do a simple animation here.
I would like to show you how to use this one.
So if they come at the beginning I take the fire here and just come and draw a simple mask that is a
circle or press control and shift fire.
I would come to my skin and the keyframe at the beginning go after a few seconds just stay here and
click on the mask.
Hopefully I put it in the center and then just make it as big as possible.
Well it's not very much in the saddle but it will work for us here.
Something like this will do no problem.
Let's go back to feet and we come back in the beginning and we make it completely kneel absent.
OK good.
Let's throw run our animation and see what happens.
Now we will let it render.
Then I'll get back to so now it does fully render.
If I play it you know this is pretty beautiful but the delimiters here you know it's very strong.
So what I want to do is just take the feather up game as much as you want it can play.
Here you are and now you have a totally you know amazing animation where the whole thing is exploding
and fire is coming up.
The nice thing about it that this fire has blew because of the background.
Of course you can use more modes here to put other layers to remove this bluish and make it maybe a
reddish or orange or whatever you want to fight.
So this is the beautiful animation we can do.
And it's quite interesting.
Of course you might want to adjust your mask a bit because this is spreading too much uniform.
You want to change it and make it a bit not so uniform.
That's it.
OK.
And you come back here for example.
I actually got like this.
Let's do it.
Here you are.
The fire is spreading and it's exploding.
And you have an explosion.
So that's about the difference and so let me show you another example.
In this example we have our ghost that is on a black background and of course we have our clouds here.
OK these are simple examples but they are very useful now not just the whites in the clouds here and
not as the block in our Gosia.
So what happens if I use difference here you are.
And then the difference is quite amazing here.
If we play them the video the guy appears and you know there's some burning of colors and it's happening
pretty cool.
Now it's a bit unpredictable what's going to happen.
And I calculated and know exactly.
But all I know is about the white and the black the black has totally disappeared.
If you notice fight.
Now if I use the other way around this use the subtract and look at the video.
Now was substracted is working a bit less than the difference you're not as there is no burning in any
area.
That's a political goal.
Now let's take the other one.
That is the Gorst which is on the black white background.
Good.
And I believe the clouds on top for example I would take here and make it a difference.
And here is what's happening because difference the yakked on the white backgrounds.
The whole image has changed to lots of black because the black was burnt using the white and now you
have a totally different animation and you have certain blue that's coming up a look at the burning
of the colors in the reddish area.
Pretty interesting and pretty beautiful fine if I changed the order I take the cloud under and I put
this one to normal and I will use here the difference again I will have the same result.
What happens if I use it subtract and now subtract the Navy has killed the background because we have
white here.
And these are the simple things that you can do with subtract and the difference divide is a whole subject
by itself.
By the way and we give you some very interesting you know animations here and some interesting change.
Now the concept is the most important about subtract and difference category.
It is very important that you learn how subducting.
And the concept of white and the Black used is difference and subtract.
So I hope you learned a lot and trying to communicate to you here that it is harder to predict the results
but you've got to train your cat to come and see what happens.
So don't be scared from divide and subtract and difference just come and try to use it and not be scared
also from the intensity of the color.
Sometimes it can give you like you've seen in the movie here it can give you something really exotic
that you can be proud of.
I see in the next lecture and I hope this was extremely useful for you.