Hi Katieh 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, Mac OS 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. By opening both a JPG and a JPEG file with an hex editor, you will notice that they share the very same heading information. You shouldn't be seeing any difference on a sequence however I recommend you stick to the .jpg extension of it works for you
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