Original subtitles

In this clip we're going to take a look at lightwrap and what exactly that is.

So light wrapping is used to simulate ambient light that is

supposedly casting light onto your subject in the scene.

So let's take a look at our script.

So first we're going to take a look at it as a step by step image

process and we're just going to take a look at the steps,

what they look like visually first and then we'll take a look

at our script so see how we can recreate it.

So here's an extracted portion of our plate and we're going to

take a look at the lightwrap matte first.

So this is our lightwrap matte.

You can see that it occurs where the edges of our subject are

and even where our fringe is on our image.

So it's appearing here on the outside of our image.

So let's take a look at the image that we're going to be wrapping.

So this is our background.

We have the portion of the image that has been added by the additive keying.

So this image is going to be wrapped around our foreground.

So let's take a look at that.

So here is our light wrap that has been premultipled.

Now you're going to notice that some of these elements,

so the yellow line there that was visible over here,

is now smeared out or blurred out and that's because we don't want to

have the solid line merged on top of our image because it will make

our edges look like they're transparent.

So we do want to just imply the overall color to our foreground image.

So now that we have a brief overview of what the lightwrap looks like by itself,

let's take a look at what it looks like applied to our image.

So let's go here.

I'm going to switch this back to 0 so we look at what

it looks like without a light wrap.

So this is no light wrap and this is with a light wrap.

So you might have noticed this is very, very subtle.

It should be.

It should just be very subtly applied to our image.

So let's take a look.

So this is without and with and you can see that the brighter areas of the

background are wrapping around our foreground image.

So darker colors do not wrap, just the letter portions.

In fact, this is a little bit too intense.

We can turn it down by probably about 50% give or take,

which is just enough so that we can see that there.

So let's take a look at the top of her hair.

And again, it just integrates it a little bit nicer.

Down here it's a little bit intense.

So a little too much around that steering wheel.

So we can dial it back,

but just to give you an idea of how it is wrapping

around our foreground subject.

So now let's take a look at what that looks like in our script.

So in our script, this is a continuation of our last module and clip.

So we have all of the blue sections that are repeats and the

teal sections which are new additions.

So let's take a look at this here.

We're going to take our background image just like we just saw previously.

So that's our final background image and we're going to take our key.

So this is just a temp key for this example and we're going

to use it to create a manual light wrap and once we

understand how to create it manually, we can take the lightwrap tool,

which is a little bit more sophisticated and gives us more

detail and wiggle room to really finesse it.

So here we have a temp key.

We're going to take that key and we're going to invert it.

We're going to blur those edges.

Blurring edges always helps us to integrate it a little bit better.

We're going to shuffle that alpha into the RGB.

So here we go, RGB.

We're going to multiply it against our plate.

So here we have our lightwrap alpha that has been

created through the multiply process.

We then take our background image.

So remember again we don't want to actually merge this 100%

image over top of our existing funnel comp because it will

make our edges look transparent.

So we are going to blur this image.

This is the one time where it's A-Okay to blur that RGB.

We don't want it to be recognizable.

Only the overall color and light to be recognizable

on top of our foreground image.

You're going to premultiply, copy it over and then premultiply it.

We forgot one set there and then merge it over top of our final plate.

So let's just take a look at that there.

So again, there is our final composite over top here.

Now let's take a look at what that looks like if I don't have that blur.

So let's just see what that blur is set to.

So it's set to 10 right now.

And here, see how it looks like it's transparent.

So again,

it's just applying this yellow color over top rather than the solid yellow line.

So now that this has been applied over top,

so again, this is our final composite,

and then we're going to place this over top of that final

composite for our final light wrap.

So let's take a look at our lightwrap tool instead and see how we

can use that tool to create the same thing.

So we're going to plug into the lightwrap tool.

A input here is going to be the temp key or your key.

B input is going to be your background and let's just

open up this lightwrap tool here.

So this is our starting point and with the lightwrap tool

we're going to set these back down to 0 and 0 and just see

exactly what they're doing.

So by default this does not generate the lightwrap only.

We do want to generate that lightwrap so we can see what we are working with.

So by default it shows up as nothing.

Diffuse, nothing until we increase the intensity.

So intensity is going to be how much we can see that light wrap pulling through,

so that applied alpha.

A diffuse will soften it out.

So the more diffuse it is,

the more it's going to wrap around our foreground subject.

We don't want to wrap it too far because wrapping it too far

is going to start to change the core of our image too much

so we do want to dial it back.

So we'll dial down the intensity.

Again, only the lighter portions are wrapped around our subject.

Bring this down so it's kind of a back and forth between the two.

So we don't want too much intensity again.

Pull this out so it's softer and in and around there is probably good.

Now notice that it does not add lightwrap to our background image,

rather only the edge of our subject,

our foreground subject and it is adding it from this very edge inwards.

So nowhere does it affect the background, only inwards.

So here is our refined lightwrap.

There we go.

This is the one that we're going to see in our final composite and we're

going to see what it looks like versus our manual light wrap.

So here is our final composite.

Let's just zoom in to here versus our manual one.

So this one has just been dialed back.

We can see this a little bit better.

Let's just take a look at what it looks like completed.

So there's our completed one.

There is our completed one.

So they've just been dialed down a little bit,

but overall they look pretty much similar so there is our manual one,

there is our other one.

You can see and it's not affecting our dark so much.

So the lightwrap tool is by far superior.

That's just going to help us to again integrate our image better

into the background with those finishing touches,

which really help to take our shot through to final.