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In this clip we're going to take a look at key mix and channel merge
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nodes and that's for combining different alphas.
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Now the following are some examples of workflows for combining multiple mattes.
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So let's take a look at our script.
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So if we take a look at our workflow down here,
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we're going to notice that we have some red reference nodes and a green one.
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Now those that are labeled in red are not recommended and
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those that are labeled in green are.
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Now the following matte combine methods are meant to
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isolate and display only the most successful portions of
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each input for the alpha matte.
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We're going to take a look at some other examples
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in the second part of this clip,
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but let's take a look at how to isolate the best parts of our keyers first.
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So in this example we have two different keylight
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tools that are pulling fringe mattes.
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Now they are made very different on purpose just so we
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can see the differences between them.
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Now by no means are they final mattes; this is for display purposes only.
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So here's the first fringe matte 01,
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here's fringe matte 02 and we're going to combine the best of both worlds.
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So I want to isolate one of the fringe mattes over here
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and the second fringe matte over here.
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To do that I have taken a merge tool and through the
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mask input attached a roto shape.
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So what I think this is going to do is isolate my A input
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over here inside the matte and then reveal the B input
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over here so let's take a look.
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So here's my merge tool and at first glance, it's doing what we want it to.
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So here is my fringe matte 02,
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isolating over here and fringe matte 01 on the left-hand side.
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However, if we take a closer look, it's not quite doing what we want it to do.
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So here is the matte 02.
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Look at those edges very quickly, very carefully,
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and it's growing them when we merge it together so instead of actually just
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isolating A over here and B over here or rather fringe matte 01,
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fringe matte 02,
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it is actually combining the A and B inputs over here on the right-hand side.
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So it's not isolating those mattes like we want them to.
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So let's take a look at another example.
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So here I have fringe matte 01, fringe matte 02,
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and I'm taking a roto shape and I'm going to isolate it.
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So here's the left-hand side, invert it.
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Here is the right-hand side.
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So that's what we want.
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So we're going to combine the two of the perfect
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sides together so there is left, there is the right,
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and merge them.
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Now at first glance, we finally got what we're looking for.
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So let's take off that overlay and take a look at that fringe matte
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02 and it's not changing the right-hand side,
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which is great.
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So this appears to be working,
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but we have a very harsh line here in the middle where the two images meet.
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So let's add a blur tool.
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Now unfortunately,
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with this method it is adding a seam in the middle and
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the more that we increase that blur, the wider that seam gets.
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So any sort of blur whatsoever starts to add that seam between the two of them,
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which doesn't really help our cause because we need to blend
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those two images or alphas together seamlessly.
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So we're going to take a look at a third example and that is the keymix.
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So the keymix works a little bit differently.
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What the keymix does is it's going to take a fringe matte 01 and
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then it's going to combine it with fringe matte 02.
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So wherever A input is and the mask input is is going to reveal A.
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So let's take a look at that alpha.
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So here's my alpha.
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It's going to reveal A over here.
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Wherever this alpha matte is not present it will reveal B so let's take a look.
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Here's our keymix.
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There is the two of them combined together.
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Again, very similar to our last example.
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That harsh edge in the middle.
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Have our list turn on our blur and it doesn't matter how
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much we increase or decrease that blur,
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we don't have that matte line that's appearing in the middle.
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So this is a really great way to combine multiple different
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mattes together and it allows us to take the best of both worlds
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while seamlessly blending them together.
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So now let's take a look at the channel merge and some different options for it.
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So in this case I want to combine a core and fringe matte together.
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We haven't necessarily modified them or we can modify them together.
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So let's just say that the entire plate of the fringe is working so here is our
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fringe and our entire core is working so there's our core.
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Again similar to our last clip,
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that core is dilating out further than our fringe so we are going
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to erode and blur it slightly and merge the two of them together
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and it's combined them together really, really well.
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Now let's take a look at a different tool which is the channel merge
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node and combine the same kind of workflow here,
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so the same erode, the same blur.
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Let's take a look at the alpha and it is identical.
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So let's take a look at that difference operator.
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Difference operator says that there are no difference between them so
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the operations or at least the outcome is identical.
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So why would we want to use one over the other?
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Well, if we take a look at the merge tool,
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it has multiple different options to it.
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So it's going to combine rgba with rgba versus the channel merge,
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which is a little bit more of a simplified tool.
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So here by default we'll go to our rgb and well it says rgba,
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but is it really combining rgb?
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Let's take a look.
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So here is rgb and here is 1, here is 2, and it is not.
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It is actually only combining the alphas versus here rgb,
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rgb, and it's combining the rgb and a together.
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So what would be the benefit of this?
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Well,
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we don't really care about the rgb because we will despill
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it separately and then pre-multiply it,
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but rather is just the efficiency of that tool.
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So the channel merge will only by default combine the two alphas versus the
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merge operator or merge tool with the over operator rather,
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is combining rgba.
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So that makes the channel merge tool generally a faster tool for processing.
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It's also really easy to recognize because it is a channel merge.
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We recognize it for merging together specific channels and therefore we
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won't get it confused with the regular merge over.
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So as a brief summary of this particular clip,
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we reveal that the keymix is the favorable tool for combining
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portions of multiple mattes and the channel merge is the preferable
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tool for combining two alphas together.
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This is primarily because it is recognized easily as a tool for combining
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channels and by default combines the alpha channels.
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