- [Instructor] Frame size is just the horizontal
and vertical resolution of your image.
Confusingly, quite a few approaches
are taken to naming them.
Now let's start with an obvious naming convention, HD.
It's 1,920 by 1,080 pixels.
Then there's 1,280 by 720 too, of course,
but full HD is 1,920 by 1,080.
This frame resolution is usually referred to
by the vertical resolution, as 1080p or 1080i,
depending on whether it's interlaced or progressive footage.
The same rule applies for 1,280 by 720 footage,
which is called 720p usually because you'll find footage
at that resolution is usually progressive.
Now things get a little more complex.
Ultra High Definition is four times the resolution of 1080.
It's exactly double the resolution on each dimension,
making it 3,840 by 2,160.
This is usually abbreviated to UHD.
In fact, there's an even bigger resolution
that's 7,680 by 4,320 pixels too.
And this is still categorized as Ultra High Definition.
It's just bigger, even more Ultra High Definition
than what I'm going to call UHD.
This is a neat system because
it so perfectly multiplies HD image sizes.
However, there are other resolutions
that are used for digital cinema projection
that have kind of been developed separately,
while consumer and later professional HD video
was coming along.
And that's 2k, 4k, 8k, and so on up the scale.
Unlike HD, this system is named according
to its horizontal resolution.
No there really is no good reason for it.
It's just the way the two approaches to video developed.
2k is 2,048 pixels by 1,080.
4k is 4,096 pixels by 2,160.
And 8k is 8,192 by 4,320 pixels.
These image resolutions have a slightly wider aspect ratio
than the 16 by 9 you'll be familiar with.
And that's the norm for digital cinema.
You'll encounter some interesting framing challenges
if you mix and match HD and 2k video,
but it's nothing insurmountable.
As with almost all media production,
the key is to plan backwards.
As long as you know the image resolution you're delivering,
you can plan for acquiring and editing accordingly.
Image resolution has settled
into these two multipliers in most cases.