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In this clip we're going to take a look at lightwrap and what exactly that is.
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So light wrapping is used to simulate ambient light that is
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supposedly casting light onto your subject in the scene.
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So let's take a look at our script.
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So first we're going to take a look at it as a step by step image
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process and we're just going to take a look at the steps,
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what they look like visually first and then we'll take a look
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at our script so see how we can recreate it.
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So here's an extracted portion of our plate and we're going to
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take a look at the lightwrap matte first.
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So this is our lightwrap matte.
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You can see that it occurs where the edges of our subject are
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and even where our fringe is on our image.
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So it's appearing here on the outside of our image.
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So let's take a look at the image that we're going to be wrapping.
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So this is our background.
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We have the portion of the image that has been added by the additive keying.
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So this image is going to be wrapped around our foreground.
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So let's take a look at that.
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So here is our light wrap that has been premultipled.
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Now you're going to notice that some of these elements,
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so the yellow line there that was visible over here,
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is now smeared out or blurred out and that's because we don't want to
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have the solid line merged on top of our image because it will make
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our edges look like they're transparent.
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So we do want to just imply the overall color to our foreground image.
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So now that we have a brief overview of what the lightwrap looks like by itself,
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let's take a look at what it looks like applied to our image.
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So let's go here.
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I'm going to switch this back to 0 so we look at what
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it looks like without a light wrap.
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So this is no light wrap and this is with a light wrap.
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So you might have noticed this is very, very subtle.
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It should be.
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It should just be very subtly applied to our image.
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So let's take a look.
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So this is without and with and you can see that the brighter areas of the
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background are wrapping around our foreground image.
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So darker colors do not wrap, just the letter portions.
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In fact, this is a little bit too intense.
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We can turn it down by probably about 50% give or take,
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which is just enough so that we can see that there.
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So let's take a look at the top of her hair.
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And again, it just integrates it a little bit nicer.
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Down here it's a little bit intense.
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So a little too much around that steering wheel.
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So we can dial it back,
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but just to give you an idea of how it is wrapping
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around our foreground subject.
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So now let's take a look at what that looks like in our script.
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So in our script, this is a continuation of our last module and clip.
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So we have all of the blue sections that are repeats and the
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teal sections which are new additions.
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So let's take a look at this here.
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We're going to take our background image just like we just saw previously.
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So that's our final background image and we're going to take our key.
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So this is just a temp key for this example and we're going
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to use it to create a manual light wrap and once we
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understand how to create it manually, we can take the lightwrap tool,
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which is a little bit more sophisticated and gives us more
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detail and wiggle room to really finesse it.
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So here we have a temp key.
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We're going to take that key and we're going to invert it.
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We're going to blur those edges.
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Blurring edges always helps us to integrate it a little bit better.
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We're going to shuffle that alpha into the RGB.
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So here we go, RGB.
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We're going to multiply it against our plate.
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So here we have our lightwrap alpha that has been
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created through the multiply process.
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We then take our background image.
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So remember again we don't want to actually merge this 100%
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image over top of our existing funnel comp because it will
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make our edges look transparent.
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So we are going to blur this image.
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This is the one time where it's A-Okay to blur that RGB.
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We don't want it to be recognizable.
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Only the overall color and light to be recognizable
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on top of our foreground image.
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You're going to premultiply, copy it over and then premultiply it.
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We forgot one set there and then merge it over top of our final plate.
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So let's just take a look at that there.
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So again, there is our final composite over top here.
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Now let's take a look at what that looks like if I don't have that blur.
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So let's just see what that blur is set to.
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So it's set to 10 right now.
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And here, see how it looks like it's transparent.
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So again,
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it's just applying this yellow color over top rather than the solid yellow line.
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So now that this has been applied over top,
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so again, this is our final composite,
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and then we're going to place this over top of that final
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composite for our final light wrap.
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So let's take a look at our lightwrap tool instead and see how we
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can use that tool to create the same thing.
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So we're going to plug into the lightwrap tool.
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A input here is going to be the temp key or your key.
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B input is going to be your background and let's just
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open up this lightwrap tool here.
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So this is our starting point and with the lightwrap tool
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we're going to set these back down to 0 and 0 and just see
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exactly what they're doing.
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So by default this does not generate the lightwrap only.
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We do want to generate that lightwrap so we can see what we are working with.
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So by default it shows up as nothing.
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Diffuse, nothing until we increase the intensity.
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So intensity is going to be how much we can see that light wrap pulling through,
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so that applied alpha.
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A diffuse will soften it out.
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So the more diffuse it is,
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the more it's going to wrap around our foreground subject.
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We don't want to wrap it too far because wrapping it too far
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is going to start to change the core of our image too much
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so we do want to dial it back.
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So we'll dial down the intensity.
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Again, only the lighter portions are wrapped around our subject.
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Bring this down so it's kind of a back and forth between the two.
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So we don't want too much intensity again.
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Pull this out so it's softer and in and around there is probably good.
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Now notice that it does not add lightwrap to our background image,
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rather only the edge of our subject,
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our foreground subject and it is adding it from this very edge inwards.
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So nowhere does it affect the background, only inwards.
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So here is our refined lightwrap.
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There we go.
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This is the one that we're going to see in our final composite and we're
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going to see what it looks like versus our manual light wrap.
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So here is our final composite.
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Let's just zoom in to here versus our manual one.
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So this one has just been dialed back.
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We can see this a little bit better.
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Let's just take a look at what it looks like completed.
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So there's our completed one.
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There is our completed one.
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So they've just been dialed down a little bit,
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but overall they look pretty much similar so there is our manual one,
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there is our other one.
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You can see and it's not affecting our dark so much.
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So the lightwrap tool is by far superior.
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That's just going to help us to again integrate our image better
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into the background with those finishing touches,
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which really help to take our shot through to final.
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