JPG vs JPEG image formats

Question

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  or JPG  for the file extension  Joint Photographic Experts Group     excerpted from the first answer there   So is there any big difference between the two extensions  And if so  what is it

User · Answer

There s no difference between the file extensions  and they are used interchangeably  I guess the 3-letter version stems from the DOS era     However  there are different  flavors  of JPEG files  Most notably the JFIF standard and the EXIF standard  Most often these just use  jpg or  jpeg as file extensions  JFIF sometimes uses  jif or  jfif

User · Answer

There is no difference between them  it just a file extension for image jpeg mime type  In fact file extension for image jpeg is  jpg   jpeg   jpe  jif   jfif   jfi

User · Answer

The term  JPEG  is an acronym for the Joint Photographic Experts Group  which created the standard   jpeg and  jpg files are identical  JPEG images are identified with 6 different standard file name extensions      jpg  jpeg  jpe  jif  jfif  jfi   The jpg was used in Microsoft Operating Systems when they only supported 3 chars-extensions   The JPEG File Interchange Format  JFIF - last three extensions in my list  is an image file format standard for exchanging JPEG encoded files compliant with the JPEG Interchange Format  JIF  standard  solving some of JIF s limitations in regard  Image data in JFIF files is compressed using the techniques in the JPEG standard  hence JFIF is sometimes referred to as  JPEG JFIF

User · Answer

No difference at all     I personally prefer having 3 letters extensions  but you might prefer having the full name  It s pure aestetics  personal taste   nothing else  The format doesn t change     You can rename the jpeg files into jpg  or vice versa  an nothing changes  they will open in your picture viewer    By opening both a JPG and a JPEG file with an hex editor  you will notice that they share the very same heading information

User · Answer

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   To read on  check out Difference between JPG and JPEG       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

User · Answer

They are identical  JPG is simply a holdover from the days of DOS when file extensions were required to be 3 characters long  You can find out more information about the JPEG standard here  A question very similar to this one was asked over at SuperUser  where the accepted answer should give you some more detailed information

[image] JPG vs. JPEG image formats

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