All language subtitles for 2. What Are Channels

[Autogenerated] in module one channel fundamentals.

What we're going to do is we're going to look at what is a channel.

What makes up a channel,

how a channel is constructed from the very bottom to the very top.

And all of these things add up to one of the most

fundamental things about channels.

And that is Well, what are they?

What exactly are channels?

We're gonna look at that, and then we're going to go into new can.

We're gonna look at what rgb light an additive color of

these channels and how it constructs an image we're going to

deeply explore in the next clip.

The Alfa.

What is the Alfa?

How does it relate to our image?

And how is it processed and layers?

What exactly are layers?

How are they constructed and what are they useful for?

So let's start with what our channels channels.

Well, one definition of channels is a means of communication or expression,

such as a path along which information such as data passes.

This is kind of like a channel of communication,

a channel of information, a channel that holds data and passes it along well,

in our case, information of data is expressed in pixels.

Now I want you to think of a channel as a box,

and within side of that channel is pixels.

Pixels are the foundation, the glue, the essence of any digital image.

Every image is made out of pixels,

and a channel is the container that holds all of these pixels together,

and we fill it with pixels.

This box holds those pixels,

but it's all the light in dark values that make that

specific image so you can have black pixels toe white

pixels in any variants in between.

We can also go greater than one or greater than white.

We can also go greater than white pixels and weaken go darker than black.

We can go into negative values,

but it's completely a container of math and numbers.

Now, each one of these channels that are a box of pixels can be modified,

moved, rearranged, combined, deleted or even added.

What we have is a container, and if you think of it as a container on the shelf,

then we can rearrange those boxes in any order that we want.

We can swap their positions, we can move them down.

We can change one of the boxes weaken.

Do anything we want with them now because there's so many different

channels and there so many different possibilities.

We want to focus down right now on the four primary color channels,

there are four primary color channels,

which are the most common that we associate.

We have our Red Channel and green and our blue channel.

Now, because these are the three primary colors of light red,

green and blue, we can combine these three channels to create any other color.

But there's one more color channel that were primarily concerned about,

and that is the Alfa.

The Alfa Channel is a measurement of occlusion,

and that occlusion allows us to do certain operations in

compositing such as transparency or opacity.

But we'll get more into that in a leader clip.

Now.

You could also think of channels as a bundle of wires,

and all the pixels are the actual copper braided wires inside of each wire.

Now think of those pixels of being wrapped into each one of those channels.

These channels ca NBI red, green, blue.

We also have our Alfa Channel, but those are the four primaries,

but we can also have many others, they can contain what we call data passes.

I also refer to these as NCD P or non color data passes.

They include depth, velocity, multi Matt,

U V P map, friend, L etcetera, etcetera.

Channels could be wrapped into layers in layers can be unlimited.

Now, each layer can contain unlimited amount of channels.

Each channel can have unlimited number of pixels in our

next clip will be going into nuke toe.

Look at the way channels can be combined.