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Welcome back
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In this video location how exactly that affects
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Merging
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Multiplication can be difficult
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I'm going to show you exactly how it works here
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3 multiplication is ultimately about the relationship
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Between your images
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And it's alpha channel
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In a properly premultiplied image
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How far is 1
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Images of pig
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Alpha channel zero
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Images completely transparent
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A great that is in between
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Image
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Let's take a look at this image for it was premultiplied
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In anyway
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Subtitled by
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Pacino
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I'm not one to one
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This is because right now is considered to be on premultiplied
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And the rtb
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With each other
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Because the RGB channel has not had the alpha cut-out applied
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Image it's pretty straightforward
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And what's going to do
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Is x
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Alpha
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What is happening here
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So here we have our
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Image we can see the alpha is for
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And we have is our mat
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And so these are perfect representations of our Alpha
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What is indicating here
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What we need to do is x
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So we can make a note here
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What's the inputs with she
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X
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Multiply
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X
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Why does Matt and you can see
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Exactly like our premultiplied image
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Load is just a simplified version of this data
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Is represented by
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RGB Alpha
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Pipe is represented by the supply now
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It's only changing your RGB
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Based on your alpha channel
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Assuming dose of the channels you have selected for pre multiplication
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A properly promoted in it has now been created because our alpha and
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Relationship between your information and your alpha is incredibly important
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An element together because of how the operation works in nuke
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Altered image here
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Create a merge
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Now this is what we're expected to look like this is our image
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Just been married over 3 multiplication was correct
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Getting any weird line
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Not seen any added but everything is working correct
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What happened
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If this wasn't supplied correctly
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What does turn off display mode
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Is getting plastered over
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This background image if we change the operation + which just add the two images together
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You will see 0 change
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Because he works
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Operation
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Is actually please plus in elements together
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It just uses the alpha channel
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It doesn't want the original image of take a look at exactly what this means
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Just a crazy person what's changed the smell of here
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2 +
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And we have a turtle
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What's over here
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And then we can do
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Omakanta Verge
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Stencil
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Outdoor sofa
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Certainly onerous this looks just like her over and just make one after the side here to that
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There is 0 different between these two measures of Visual EC exam
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So we have her back Village
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Taking her Alpha
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Background image
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And then passing the entirety of this a pipe
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Into you are back
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At this point
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The alpha is not affecting what is getting passed over
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Extent or alpha is applied in RGB
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No change
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Type over
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Suddenly when your Image is not premultiplied correctly
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You get all of this on
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That's because our alpha is not correct
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When it comes to the stage it doesn't matter where your outfit is as far as he's concerned all that matters
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So this is why when you don't have an alpha channel
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Images of plus together
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I'll take a look at another example
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Happened
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If we accidentally pre-ordered this twice
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Slight
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And that's because promoting our image once and then you can see it
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Has it changed in size
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The Passover is head multiplication apply twice so it's edges or twice is
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As they were intended to be
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And these Dark Hedges
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And the additive issues that we sorted
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Are the two main issues
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When your footage is not 3 multiplied correctly
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And why is that
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Again
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This is a full Alpha
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Ask limit
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There
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Change the two mask
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Operation
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Is essentially a multiplying your rgba
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By the Alpha
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It's very similar to 3 multiplication
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Accepted also changes the Alpha
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What sensor is affecting
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Your alpha and your RGB equally
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This is a safe operation that will cause any pre multiplication issues
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Because remember
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Our end goal is to have an RGB
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With her alpha channel
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Affects both equally
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So this is a properly premultiplied in
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With the central it is affecting our alpha channel
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And rrgb equally
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Inside the image remains correctly premultiplied and ready to merge
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Multiplication
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What's happened to actually going to put this into practice
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Purposely break or 3 multiplication
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Get better key
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