JPG or JPEG: First, I do know what the acronym means. My question, here, is why do I see image files showing one or the other, depending on what I’m doing on my computer? Or sometimes...

kb6kgx Loc: Simi Valley, CA

First, I do know what the acronym means. My question, here, is why do I see image files showing one or the other, depending on what I’m doing on my computer? Or sometimes the letters are all lower case or they are in caps. It might be a stupid question to some, but I’d like to know.

Ysarex Loc: St. Louis

Joint Photographic Experts Group

The proper acronym would be JPEG but JPG became popular in usage because of the 3 letter suffix restriction in the Windows OS.

CHG_CANON Loc: the Windy City

Most consumer personal computer software are case indifferent. So, JPG = jpg = jPg = JpG and so forth.

Most consumer personal computer software recognize JPEG and JPG as both representing digital image files encoded to the JPEG standard.

Apple seems to like to use JPEG, where cameras and Windows-based computers prefer the old 8x3 file format of 12345678.jpg

BebuLamar

My JPEG files have extension .JPG

robertjerl Loc: Corona, California

kb6kgx wrote:

First, I do know what the acronym means. My question, here, is why do I see image files showing one or the other, depending on what I’m doing on my computer? Or sometimes the letters are all lower case or they are in caps. It might be a stupid question to some, but I’d like to know.

A rose by any other name...

mwsilvers Loc: Central New Jersey

Ysarex wrote:

Joint Photographic Experts Group

The proper acronym would be JPEG but JPG became popular in usage because of the 3 letter suffix restriction in the Windows OS.

DirtFarmer Loc: Escaped from the NYC area, back to MA

Lightroom recognizes x.jpg and x.jpeg as different files.

Longshadow Loc: Audubon, PA, United States

robertjerl wrote:

A rose by any other name...

Yup.
I use JPG, JPEG, and sometimes jpg. Depends on how I feel at the time, and how the editor appends.

For the most part, Windows is case insensitive even though it will display the capitals as opposed to lower case. In Windows, "File.JPG" and "file.jpg" are the same file. Both cannot simultaneously exist on a Windows system.

UNIX (and variants) on the other hand, "File.JPG" and "file.jpg" are totally different files. UNIX is case sensitive. Gets me sometimes when I push files to my website server, which is UNIX based.

Longshadow Loc: Audubon, PA, United States

DirtFarmer wrote:

Lightroom recognizes x.jpg and x.jpeg as different files.

That's because they ARE different files.... in ANY operating system.
Different amount of characters in the filename.

But Lightroom (due to the OS) doesn't care if it is x.JPG or x.jpg, same file.

gvarner Loc: Central Oregon Coast

If you say jpg really really fast it comes out jpeg. Maybe that’s it.

Longshadow Loc: Audubon, PA, United States

gvarner wrote:

If you say jpg really really fast it comes out jpeg. Maybe that’s it.

Could be "j-pig" also, depending on what part of the world one is from.

I kinda think that whomever said it earlier was correct, original was jpeg and due to the computer OS it had to have the extension shortened to jpg. Original DOS file names were 8.3 characters.

gvarner Loc: Central Oregon Coast

Longshadow wrote:

Could be "j-pig" also, depending on what part of the world one is from.

I kinda think that whomever said it earlier was correct, original was jpeg and due to the computer OS it had to have the extension shortened to jpg. Original DOS file names were 8.3 characters.

It comes from the Joint Photographic Experts Group and shortened to jpg to conform to the OS file naming standard.

burkphoto Loc: High Point, NC

CHG_CANON wrote:

Most consumer personal computer software are case indifferent. So, JPG = jpg = jPg = JpG and so forth.

Most consumer personal computer software recognize JPEG and JPG as both representing digital image files encoded to the JPEG standard.

Apple seems to like to use JPEG, where cameras and Windows-based computers prefer the old 8x3 file format of 12345678.jpg

In the original MacOS, files had 4-character Creator Codes and 4-character File Type codes embedded in the file headers. There were no visible extensions. That’s where JPEG, TIFF, GIFF, AIFF, TEXT, and most other 4-character file codes came from.

Now, however, most Mac files use three character extensions (.txt, .jpg, .png, .app, etc.), and have no Creator Codes. The OS is defaulted to open all files of a particular extension with a preset application — that you can change whenever needed. But Mac file type extensions can be longer… and you can hide the extensions in the Mac Finder (why anyone would want to hide extensions is beyond me!).

Longshadow Loc: Audubon, PA, United States

burkphoto wrote:

In the original MacOS, files had 4-character Creat... (show quote)

One can hide extensions in Windows also. Like you I cannot see ANY reason whatsoever to do this. The extension quickly tells me the file type.

DirtFarmer Loc: Escaped from the NYC area, back to MA

Longshadow wrote:

One can hide extensions in Windows also. Like you I cannot see ANY reason whatsoever to do this. The extension quickly tells me the file type.

And, inexplicably, hiding the extensions is the Windows default.