File extension question

[Alpo]

I was just moving some pictures around, and noticed that some of them were .JPG, while others were .JPEG.

 

Wondered why. Anybody know?

[Tyrel Cody]

I blame Windows

 

http://www.differencebetween.info/difference-between-jpg-and-jpeg

[Subdeacon Joe]

http://stackoverflow.com/questions/23424399/jpg-vs-jpeg-image-formats

• 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.

• 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.