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Guys and welcome to this new lecture where we are going to tackle here the difference category the difference

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category have some special effects that I like very much.

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It's hard to predict what the difference will do or not because aftereffects goes randomly but because

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the calculations are pretty hard.

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But there are two exceptions about the black and the white color that are very useful.

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The best way to demonstrate you is using these two shapes with different colors for their borders and

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their field videos it will become quite hard to you know show you the difference and show you how that

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works.

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Let's take the source.

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That's the top layer and change it to difference what aftereffects did here is to subtract the darker

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color the stronger cause from the lighter ones.

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And then you have the result the White has been subtracted from the red and you have the result.

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Same same for this pink area here.

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The White has been removed from the green and you have the results here.

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So that is a difference and it's quite complicated to predict the results but it's quite easy to look

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at the results.

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One major difference about difference is that if one of the background is black for example then the

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underlying colors are not changed at all.

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So you see here because I put black in the field then the green and the red did not change at all.

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If it is wide then that is quite some change.

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Let's leave it to right now.

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This is about difference.

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If you go to classic difference is useless because it's just for compatibility.

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If you go to exclusion now also it does the same calculation but it is with less intensity.

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And that's it about exclusion.

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If you go to subtract now it becomes more interesting not just the black area.

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Subtract if the source is white then the result is black and that is pretty interesting.

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Just give it a thought.

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If the source is white then the result is black.

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So it is pretty interesting when you have a video or an image that has lots of white.

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You can't turn them into black.

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Using subduct quite interesting.

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Right now the vivid here is the whole subject by itself.

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But nevertheless in the vivid you know this is when the source is white then there is no change in the

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underlying cause.

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But this is pretty good.

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I have explained to you about the black and white and how it works.

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Let's get an example.

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I will hide this ones and open the shy and I have two layers here.

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The escalator that you have already see it and the fire that I want to show you now.

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Hopefully it will render pretty fast.

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This is the fire.

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If you know this also a motion graphic that I use a lot.

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This file comes from picks.

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You can take some areas and make it very very interesting.

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So this is our fire.

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Now what are we going to do if you put the escalator and we use this phrase like it's already there

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and we run.

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You're not is that it has some amazing effect.

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Just want to show you know how the fire has spread all over the town.

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If you want but look it's not effective everywhere.

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If you for example multiply your lot is somehow uniform.

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If you as the others even overlay it's very uniform.

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But with that difference it is not uniform at all because of the subtraction.

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So you have the blues here you have the ultimate red fire here.

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And if you go in Florida you notice that the fire is consistent with the color.

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So that is what subduct does or the difference does and it's very interesting if you go to subtract

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now then the whole thing has changed and it's pretty interesting.

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Now you have a dark scene where the fire just spreads.

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Let's do a simple animation here.

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I would like to show you how to use this one.

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So if they come at the beginning I take the fire here and just come and draw a simple mask that is a

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circle or press control and shift fire.

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I would come to my skin and the keyframe at the beginning go after a few seconds just stay here and

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click on the mask.

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Hopefully I put it in the center and then just make it as big as possible.

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Well it's not very much in the saddle but it will work for us here.

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Something like this will do no problem.

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Let's go back to feet and we come back in the beginning and we make it completely kneel absent.

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OK good.

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Let's throw run our animation and see what happens.

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Now we will let it render.

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Then I'll get back to so now it does fully render.

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If I play it you know this is pretty beautiful but the delimiters here you know it's very strong.

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So what I want to do is just take the feather up game as much as you want it can play.

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Here you are and now you have a totally you know amazing animation where the whole thing is exploding

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and fire is coming up.

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The nice thing about it that this fire has blew because of the background.

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Of course you can use more modes here to put other layers to remove this bluish and make it maybe a

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reddish or orange or whatever you want to fight.

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So this is the beautiful animation we can do.

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And it's quite interesting.

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Of course you might want to adjust your mask a bit because this is spreading too much uniform.

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You want to change it and make it a bit not so uniform.

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That's it.

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OK.

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And you come back here for example.

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I actually got like this.

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Let's do it.

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Here you are.

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The fire is spreading and it's exploding.

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And you have an explosion.

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So that's about the difference and so let me show you another example.

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In this example we have our ghost that is on a black background and of course we have our clouds here.

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OK these are simple examples but they are very useful now not just the whites in the clouds here and

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not as the block in our Gosia.

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So what happens if I use difference here you are.

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And then the difference is quite amazing here.

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If we play them the video the guy appears and you know there's some burning of colors and it's happening

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pretty cool.

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Now it's a bit unpredictable what's going to happen.

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And I calculated and know exactly.

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But all I know is about the white and the black the black has totally disappeared.

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If you notice fight.

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Now if I use the other way around this use the subtract and look at the video.

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Now was substracted is working a bit less than the difference you're not as there is no burning in any

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area.

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That's a political goal.

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Now let's take the other one.

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That is the Gorst which is on the black white background.

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Good.

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And I believe the clouds on top for example I would take here and make it a difference.

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And here is what's happening because difference the yakked on the white backgrounds.

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The whole image has changed to lots of black because the black was burnt using the white and now you

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have a totally different animation and you have certain blue that's coming up a look at the burning

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of the colors in the reddish area.

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Pretty interesting and pretty beautiful fine if I changed the order I take the cloud under and I put

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this one to normal and I will use here the difference again I will have the same result.

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What happens if I use it subtract and now subtract the Navy has killed the background because we have

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white here.

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And these are the simple things that you can do with subtract and the difference divide is a whole subject

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by itself.

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By the way and we give you some very interesting you know animations here and some interesting change.

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Now the concept is the most important about subtract and difference category.

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It is very important that you learn how subducting.

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And the concept of white and the Black used is difference and subtract.

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So I hope you learned a lot and trying to communicate to you here that it is harder to predict the results

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but you've got to train your cat to come and see what happens.

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So don't be scared from divide and subtract and difference just come and try to use it and not be scared

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also from the intensity of the color.

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Sometimes it can give you like you've seen in the movie here it can give you something really exotic

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that you can be proud of.

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I see in the next lecture and I hope this was extremely useful for you.