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[Autogenerated] in this clip, we're going to create a light rap.
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Light rap is a phenomenon that happens when we photograph things,
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and brighter areas of the image tend to bleed into
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foreground areas of the image.
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And this is something that's missing from this render right now.
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What we want to do is we want to build a tool that takes
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the bright pixels of the background,
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allows us to detect the edges of our element,
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brighten them and subtract them and add them into the edge
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here to give us a more pleasing look.
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So let's take a look at how Channel merge can help us do that.
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First thing to do is understand that we have this element right here.
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We have this helicopter and we have an Alfa Channel,
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and it's using this Alfa Channel that we want to do to detect the edges,
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to create an edge and to take the background and we're going to
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use a Keir Channel merges in a variety of ways to subtract and
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combine are different channels.
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So let's start this out by going ahead and creating a luminous key.
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Even grab Bakir we're gonna attach to our background now the reason we
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need to do this is we want to take the bright levels and dark levels of
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the background and kind of crunched them down.
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And that looks about good.
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So let's close that We can always come back to that later.
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And now we're going to put a dot note in.
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We'll bring this down here.
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I liked to do things neat and organized.
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Rude.
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Fast.
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Well, look that up now, this dilate right here.
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What it's going to do is we're going to use it to shrink our mask.
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So we have this Alfa Channel right here,
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and we're gonna shrink it down a little bit like that,
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about 3.2 pixels, and then we're gonna make a copy of this.
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We're gonna hook it to the same input.
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Except this time we're gonna make it a positive 3.2 pixels.
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So what we've done is we've taken the original and we've expanded it,
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and we've contracted it.
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And what we're gonna do is we're gonna grab one of our channel merges,
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and we're gonna set this up.
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We're gonna put it to let's reverses inputs A and B,
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and let's view the results Okay, so right now it's you needing,
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and we don't want it to be union.
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We actually want to switch it to minus Great.
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So, you see, what we've done is we've taken that channel, the two Alfa channels.
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We made one bigger one smaller.
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And by doing that, we've now created this outline of our helicopter.
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We can control each side of the outline with the two functions So
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we can do this one which controls the outer barrier or the negative
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barrier controls the inner diameter.
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What's closed us.
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And now I'm gonna put a blur.
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No, down this blur node.
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It's so we can soften it slightly.
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There we go.
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All right.
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And now let's put a grade right here and this grade node,
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and so we can take the gain and weaken.
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Brighten it slightly.
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Now we're operating on Alfa Channel,
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so we have to make sure that our grade is set to operate on the Alfa as well.
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That way, we can use this to either brighten or darken her outline.
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So now I need to do a couple of things here.
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We want to take our grade note and we want to create another another
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channel merge because this time I want to take the result of our outline
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and stencil it with a inverted version of this.
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So what we're gonna do is we're gonna invert this.
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So let's create a invert node and we're going to invert our Alfa,
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and we're gonna hook this up to our channel merge,
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and we're going to switch this to stencil now What?
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This is done.
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It's copied the outline of our helicopter edge back into here
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because through the process of blurring,
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we've now gotten a nice inter gradation like that.
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But we don't want to add more pixels to the to the background.
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We just want to add more pixels to the foreground.
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So we need to subtract the original Alfa from this.
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And that's exactly what we're doing by stencil ing it like that.
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Now we got to come back to our original color key appear blue Mickey,
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we're gonna bring that down.
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That's just gonna connected up and let's grab a another channel merge,
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and we're gonna hook that in two are a side and we hooked the previous channel.
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Marge Darby side.
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Now,
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the idea here is to take what we had Let me put that dot note
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back in second view that we're going to take this and we're
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going to subtract this from this.
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So that way, because lets go back, appear for a minute.
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And look, we want to add bright pixels to the bright areas back here.
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But if it's in shadow down here, we don't want to add bright pixels today.
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That's gonna look really weird by doing this way by
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taking a look at the Alfa Channel.
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And now because this is black and if we subtract this from the other one,
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we can get a much better result now.
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Right now, it's doing a union, and we're gonna choose in.
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So it is now taken the background and subtracted it from,
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or put it into the other image.
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And now we have our bright pixels.
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Also we need to do now is to combine this with the original
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color of the plate so we can use the color information from
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the plate as our brightened pixels.
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So let's go back to the shuffle copy and hook up a shuffle.
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Copy.
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Let's use the DOT ____ right here,
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and we're just gonna connect this back up to our
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original colored plate right up there.
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In fact, what's do a little trick here?
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I'm gonna hide the input to this dot node and just put on here.
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I'm gonna label it as a plate like that.
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And now the air goes away, but we're still seeing the plate.
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So shuffle copy down here wants to be RGB on input one.
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So we go our g b and they were grabbing that Alfa
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out of input to see input to Alfa.
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Close it off.
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Let's view that.
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So here's our Alfa.
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There's are rgb and we're gonna put a pre mult after that.
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So what we've done here is instead of having just Alfa now it is colored
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and we're gonna take this and this is what we're going to merge back on
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to our plate and when emerging as a plus,
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you know, add it on.
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So take this, put it down to our promotes,
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and let's just kind of just needing this up a little bit like that.
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There we go.
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Let's take a look.
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So here's our helicopter and now here's our light rap.
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Now we do have a little bit of a ghosting effect,
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and we have to tweak our levels a little bit.
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One thing that is important is that you blur the background.
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So I'm gonna create a new blur.
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We're gonna put it right here on the background,
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loom in its and we're going to use the keyboard Cherica Control K,
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which is going to clone that blur and then control V paste.
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And I have a cloned blur that's going to blur both the color of the
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plate as well as this Alfa Channel right here.
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And we should just have to do just a little bit of blurring right here.
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There we go.
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See,
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we're trying to get rid of that right there that's
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making it look kind of transparent,
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about 30 pixels right there and then weaken tone down on the
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amount of our glow with the mix right there.
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Here we go,
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a beautiful late rap created with channel merges again we subtracted
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over here to take a dilate to do manual edge detection.
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Then we stenciled an invert of it and then we brought in the
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background loom in its to create our light rap.
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Using channel merges in this way is a very powerful tool.
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Remember a channel merge our merge operations that do ____
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medical functions and operations on channels.
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You'll find them most useful in operating on alphas,
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but they can be used for any channel in the image stream.
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In the next module, we're gonna look Atmore efficient work flows,
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removing channels, packing channels and and working with the copy note.
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