JPG Extensions

Would anyone know why some of my jpegs taken from the same camera have a capital letter extension, and some have a lower case extension. ?

I just took a capital letter one and resized it to see if my image viewer program is doing this conversion, but it didn't change it to lower case. They seem to be the same type of file. ?

Bigger images have a bigger extension, makes sense to me :smiley:

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Nvm, the lower case is from my smartphone, the uppercase is from my camera.
But I still don't know why there are two different types of extension of the same file type.

The extension is the same since filenames are not case-sensitive.

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True, but I was wondering if those are the same file types. Google search only talks about JPG vs JPEG, not JPG vs jpg.

Windows explorer doesn't have an extension pane. Every file is capital .JPG in list view.
The properties show the respective Dopus case sensitivity in brackets.
JPG
JPG 2

This is confusing, but I get the feeling these are the exact same file types, but with weird different extensions but the same extensions. The problem is I can actually divide these two types by the lister column (ext) filter. Since they are the same file type that probably isn't ideal. But it might come in handy, come to think of it, since that difference indicates the device source, and I don't have any other column that handles that particular metadata field, I don't think.

They are exactly the same file type. File extensions aren't case sensitive in Windows. JPG = jpg = JpG = jPg = JPg = jPG and so on.

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Ok. I found the 'Camera Make' and 'Camera Model' folder format fields too.
But I discovered my folder didn't auto-set to the 'Images' type. I will have to investigate that.
None

Thanks for the help. :blush:

The Images folder format was just glitching out on me for some reason. It's working fine now.

I've added .svg and .raw to the image file types. You might want to add that to the factory defaults.

.jpg and .jpeg (lower or upper case) are the common and recommended default extensions for JPEG files.

Microsoft has a standard function CImage::GetImporterFilterString, see Remarks there.
If you use that in a program, you get following result:

File_Open_crop

.jpe is simple truncation of .jpeg to 3 characters.
.jfif is JPEG File Interchange Format.
You could add .jff and .jfi respectively.

So:
Minimum extension support for JPEG files:

.jpg, .jpeg

Maximum extension support for JPEG files:

.jpg, .jpeg, .jpe, .jfif, .jff, .jfi

Regards
Guido
JPEG developer

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