But wait, how exactly does JPEG work?

但是等等，JPEG究竟是怎么工作的呢？

This same idea is the basis of lossy compressed image formats, most famously JPEGs.

这个同样的理念是有损压缩图像格式的基础，最着名的就是JPEG。

In JPEG, the P isn't short for " potography" .

在JPEG中，P并不是“摄影”的缩写。

There are no jpegs or tifs included on it.

上面没有包含 jpeg 或 tif。

Although you could probably argue that JPEG does have some understanding of images.

尽管你或许可以辩称，JPEG确实对图像有一定的理解。

There are three prime numbers associated with the original JPEG image.

原JPEG图像关联着三个质数。

Ugly monkey JPEGs sold by and for dipshits.

由蠢货们买卖的丑猴子JPEG图并列。

I mean, I know JPEG Mafia is, I mean.

我的意思是，我知道JPEG Mafia，我是说。

I'm getting something on the uplink. It's a JPEG.

上行线路上有新信息 是张图。

And over here, we have the same image as a compressed JPEG and it uses 4.1 megabytes.

而在这里，我们有一张同样被压缩为JPEG格式的图，用了4.1兆字节。

First, most digital images from your phone or a camera are saved using the JPEG format.

首先，你手机或相机中的大多数数字图都是以JPEG格式保存的。

Well, that's 26 seconds, so let's get back to seeing what JPEG does.

好吧，这是26秒，所以我们继续看看JPEG做了什么。

So think your PDF files, this could be an image, your PNGs, your JPEGs, your audio files, your video files.

所以你的PDF文件， 这可能是图像，你的PNG图， 你的JPEG图， 你的音频文件，你的视频文件。

(LAUGHTER) But my favorite part has to be the clip of a Playboy JPEG loading one centimeter at a time.

（笑声）但我最喜欢的部分必须是那段花花公子JPEG图一厘米一厘米加载的段。

Here we can see the inner workings of the JPEG compression hard at work.

在这里我们可以看到JPEG压缩算法的内部运作正在全力工作。

JPEG compression algorithm is composed of five key steps, each with a rather complicated name.

JPEG 压缩算法由五个关键步骤组成，每个步骤都有一个相当复杂的名称。

So, that's an extreme example, going from a slightly compressed JPEG to a highly compressed one, one-eighth the original file size.

所以，这是一个极端的例子，从稍微压缩的JPEG到高度压缩的JPEG，文件大小只有原来的八分之一。

But before we dive into the details, it's first important to understand the reason why JPEG works.

但在我们深入细节之前，首先需要理解JPEG为何有效的原因。

So let's see how the JPEG algorithm exploits the nuance of the human eye.

所以让我们看看JPEG算法是如何利用人眼的微妙特性的。

In short, JPEG goes through and analyzes each section of an image and finds and removes elements that your eyes can't easily perceive.

简而之，JPEG会对图像的每个部分进行分析，并找出并移除你的眼睛难以察觉的元素。