Original subtitles

Welcome back

In this video location how exactly that affects

Merging

Multiplication can be difficult

I'm going to show you exactly how it works here

3 multiplication is ultimately about the relationship

Between your images

And it's alpha channel

In a properly premultiplied image

How far is 1

Images of pig

Alpha channel zero

Images completely transparent

A great that is in between

Image

Let's take a look at this image for it was premultiplied

In anyway

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Pacino

I'm not one to one

This is because right now is considered to be on premultiplied

And the rtb

With each other

Because the RGB channel has not had the alpha cut-out applied

Image it's pretty straightforward

And what's going to do

Is x

Alpha

What is happening here

So here we have our

Image we can see the alpha is for

And we have is our mat

And so these are perfect representations of our Alpha

What is indicating here

What we need to do is x

So we can make a note here

What's the inputs with she

X

Multiply

X

Why does Matt and you can see

Exactly like our premultiplied image

Load is just a simplified version of this data

Is represented by

RGB Alpha

Pipe is represented by the supply now

It's only changing your RGB

Based on your alpha channel

Assuming dose of the channels you have selected for pre multiplication

A properly promoted in it has now been created because our alpha and

Relationship between your information and your alpha is incredibly important

An element together because of how the operation works in nuke

Altered image here

Create a merge

Now this is what we're expected to look like this is our image

Just been married over 3 multiplication was correct

Getting any weird line

Not seen any added but everything is working correct

What happened

If this wasn't supplied correctly

What does turn off display mode

Is getting plastered over

This background image if we change the operation + which just add the two images together

You will see 0 change

Because he works

Operation

Is actually please plus in elements together

It just uses the alpha channel

It doesn't want the original image of take a look at exactly what this means

Just a crazy person what's changed the smell of here

2 +

And we have a turtle

What's over here

And then we can do

Omakanta Verge

Stencil

Outdoor sofa

Certainly onerous this looks just like her over and just make one after the side here to that

There is 0 different between these two measures of Visual EC exam

So we have her back Village

Taking her Alpha

Background image

And then passing the entirety of this a pipe

Into you are back

At this point

The alpha is not affecting what is getting passed over

Extent or alpha is applied in RGB

No change

Type over

Suddenly when your Image is not premultiplied correctly

You get all of this on

That's because our alpha is not correct

When it comes to the stage it doesn't matter where your outfit is as far as he's concerned all that matters

So this is why when you don't have an alpha channel

Images of plus together

I'll take a look at another example

Happened

If we accidentally pre-ordered this twice

Slight

And that's because promoting our image once and then you can see it

Has it changed in size

The Passover is head multiplication apply twice so it's edges or twice is

As they were intended to be

And these Dark Hedges

And the additive issues that we sorted

Are the two main issues

When your footage is not 3 multiplied correctly

And why is that

Again

This is a full Alpha

Ask limit

There

Change the two mask

Operation

Is essentially a multiplying your rgba

By the Alpha

It's very similar to 3 multiplication

Accepted also changes the Alpha

What sensor is affecting

Your alpha and your RGB equally

This is a safe operation that will cause any pre multiplication issues

Because remember

Our end goal is to have an RGB

With her alpha channel

Affects both equally

So this is a properly premultiplied in

With the central it is affecting our alpha channel

And rrgb equally

Inside the image remains correctly premultiplied and ready to merge

Multiplication

What's happened to actually going to put this into practice

Purposely break or 3 multiplication

Get better key