JPG与JPEG图像格式 [英] JPG vs. JPEG image formats

问题描述

我经常使用 JPEG 图片，我注意到有两个非常相似的文件扩展名： .jpg ，我的手机相机和预览应用程序使用， .jpeg ，图像捕捉保存图像使用我的 Canon MX455 打印机进行扫描。 LaTeX 似乎没有区别，因为我给它一个 .jpeg ，扩展名改为 .jpg ，结果似乎与从一开始就是 .jpg 一样。我想知道两者之间的区别是什么。我遇到过这个问题，并且肯定会通读它，虽然目前我的时间略有不足。但是，从我看到的快速浏览，似乎没有区分这两个扩展。事实上，文件类型的名称似乎是 JPEG ，文件扩展名为 .jpg ：

I often use JPEG images, and I have noticed that there are two very similar file extensions: .jpg, which my mobile's camera and the Preview application use, and .jpeg, with which Image Capture saves the images from scanning with my Canon MX455 printer. LaTeX doesn't seem to distinguish, as I gave it a .jpeg with the extension changed to .jpg and the result seems to be the same as if it had been a .jpg right from the start. I have wondered what the difference between the two is. I have come across this question, and will certainly read through it, though at the moment I'm slightly out of time. However, from what I saw giving it a quick look, it seems not to distinguish the two extensions. In fact, it seems the file type's name is JPEG and the file extension is .jpg:

JPEG（或JPG，用于文件扩展名;联合图像专家组）

JPEG (or JPG, for the file extension; Joint Photographic Experts Group)

（摘自第一个答案）。那两个扩展之间有什么大的区别吗？如果是这样，它是什么？

(excerpted from the first answer there). So is there any big difference between the two extensions? And if so, what is it?

推荐答案

JPG和JPEG都支持联合图像专家提出和支持的图像格式组。这两个术语具有相同的含义并且可以互换。

JPG and JPEG stand both for an image format proposed and supported by the Joint Photographic Experts Group. The two terms have the same meaning and are interchangeable.

要继续阅读，请查看 JPG和JPEG之间的区别。

不同文件扩展名的原因可追溯到Windows的早期版本。联合图像专家组文件格式的原始文件扩展名为.jpeg;但是在Windows中，所有文件都需要三个字母的文件扩展名。因此，文件扩展名缩短为.jpg。但是，Macintosh不限于三个字母的文件扩展名，因此Mac用户使用.jpeg。最终，随着升级，Windows也开始接受'.jpeg'。但是，许多用户已经习惯使用'.jpg'，因此三个字母的文件扩展名和四个字母的扩展名开始常用，现在仍然是。

The reason for the different file extensions dates back to the early versions of Windows. The original file extension for the Joint Photographic Expert Group File Format was ‘.jpeg’; however in Windows all files required a three letter file extension. So, the file extension was shortened to ‘.jpg’. However, Macintosh was not limited to three letter file extensions, so Mac users used ‘.jpeg’. Eventually, with upgrades Windows also began to accept ‘.jpeg’. However, many users were already used to ‘.jpg’, so both the three letter file extension and the four letter extension began to be commonly used, and still is.

今天，最常被接受和使用的形式是'.jpg'，因为许多用户是Windows用户。成像应用程序（如Adobe Photoshop）可以在Mac和Windows上保存所有带有.jpg扩展名的JPEG文件，以避免混淆。联合图像专家组文件格式也可以使用大写的.JPEG和.JPG文件扩展名保存，这些文件扩展名不太常见，但也被接受。

Today, the most commonly accepted and used form is the ‘.jpg’, as many users were Windows users. Imaging applications, such as Adobe Photoshop, save all JPEG files with a ".jpg" extension on both Mac and Windows, in an attempt to avoid confusion. The Joint Photographic Expert Group File Format can also be saved with the upper-case ‘.JPEG’ and ‘.JPG’ file extensions, which are less common, but also accepted.

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